God, the Unchanging Helper

There are two doorways in Scripture that I want you to stand in before you leave this page, and both of them have a stranger on the other side.

The first doorway is a tent flap in the plains of Mamre. It is the hottest part of the day, the hour when even the animals go still and every sensible man in the ancient Near East is horizontal in the shade. Abraham is ninety-nine years old. He has been carrying a promise for a quarter of a century, a promise that has aged worse than he has. And Genesis 18 opens with a line that decides everything before Abraham does anything: And the Lord appeared unto him. Then, and only then, comes Abraham's part: he lifted up his eyes and looked, and, lo, three men stood by him. And when he saw them, he ran to meet them from the tent door, and bowed himself toward the ground.

A ninety-nine-year-old man runs in the noonday heat toward strangers he has not yet identified. Hold that image; we will come back to it.

The second doorway is the last page of a letter written to a battered, homesick congregation of Jewish believers who were losing everything for the name of Christ. The writer of Hebrews, having spent twelve chapters proving that Jesus is better, comes to the end and gets practical: let brotherly love continue. Be not forgetful to entertain strangers, for thereby some have entertained angels unawares. Remember them that are in bonds. Let your conversation be without covetousness, and be content with such things as ye have. And then he plants his flag on the promise that holds the whole chapter upright: for He hath said, I will never leave thee, nor forsake thee. So that we may boldly say, The Lord is my helper, and I will not fear what man shall do unto me. And a few lines later, the sentence that could serve as the title of eternity: Jesus Christ the same yesterday, and to day, and for ever.

Two doorways, two millennia apart, and the same theology holding them both open: the God who shows up before you go looking, the God whose timing you can trust when your body says otherwise, the God who does not change and therefore cannot fail you.

Three things I want to work into your bones today: make the first move, because He already did; be content and trusting in His timing; and settle it forever that the God who never changed will not change on you now.

Come stand in the doorway with me. There is Someone on the road.

I. Make the First Move, Because He Already Did: The Great Paradox

Let us begin with the paradox, because it is the engine of the whole Christian life and almost everybody gets the order wrong.

Read Genesis 18:1 slowly: And the Lord appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day. Notice what has already happened before Abraham lifts a finger. The Lord appeared. The initiative belongs entirely to heaven. Abraham did not summon this visit. He did not fast for it, campaign for it, or schedule it. He was sitting in a tent door in the middle of a nap-hour, an old man in an ordinary afternoon, and God simply came.

That is the gospel in miniature, and it is the pattern of Scripture from the first page to the last. In the garden, it was not Adam calling out for God; it was God walking in the cool of the day calling, where art thou? At Bethel, Jacob wakes up from a dream and confesses, surely the Lord is in this place, and I knew it not. Moses did not find a burning bush; a burning bush found a fugitive. Paul was not seeking Christ on the Damascus road; Christ was seeking a persecutor. And John writes the summary over all of it: herein is love, not that we loved God, but that He loved us. We love Him because He first loved us. Grace always moves first, and it moves toward you while you are still sitting down.

Grace always moves first, and it moves toward you while you are still sitting down.

But now watch the second half of the paradox, because grace's initiative does not produce passivity; it produces urgency. What does Abraham do the instant he perceives the visitation? He ran. Genesis piles up verbs like a man late for his own destiny: he ran to meet them, he bowed himself, he hastened into the tent unto Sarah, he said make ready quickly three measures of fine meal, he ran unto the herd and fetched a calf tender and good, he gave it unto a young man who hasted to dress it, and then he stood by them under the tree while they ate.

Do you see the paradox? God moved first, and Abraham moved fast. Divine initiative did not make human response optional; it made it possible and it made it urgent. Some believers hear "God moves first" and settle into a spiritual recliner, waiting for heaven to do everything. That is not faith; that is fatalism wearing a Sunday suit. And other believers hear "run" and turn the Christian life into a sweaty campaign to earn a God who is already standing at their tent door. That is not faith either; that is religion. The truth stands in the middle and holds both hands: because He has already come to you, run to Him; you are never the initiator, but you are always the responder.

God moved first, and Abraham moved fast. Divine initiative did not make human response optional; it made it possible and it made it urgent.

And mark what Abraham's running consisted of, because it was not a religious performance. It was hospitality. Bread, butter, milk, a calf, shade, water for tired feet. He did not know at first that he was hosting the Lord; the text says three men stood by him. The revelation unfolded in the middle of the service. Which is exactly what Hebrews reaches back to grab: be not forgetful to entertain strangers, for thereby some have entertained angels unawares. Unawares. Meaning the entertaining came before the awareness. Meaning some of the greatest visitations of your life will arrive disguised as an inconvenient knock at the worst hour of your day.

So let me press this personally. God has already made His move toward you; the cross settled that question permanently. But there is a tent door in your life, and there is a stranger on your road, and the question is whether you will run in the heat of the day. Will you make the first move toward the neighbor, the estranged sibling, the coworker in crisis, the visitor nobody greeted, the person whose need arrives at a genuinely inconvenient hour? Abraham was ninety-nine, and he ran. Some of us are thirty-five and cannot be bothered to walk. Heaven's visitations tend to come to people who are still willing to run.

II. Be Content and Trusting in His Timing: The Laugh Behind the Tent

Now come inside the tent, because the second movement of this text is about the thing that erodes more faith than persecution ever has: delay.

After the meal, the visitor asks a question that seems logistical and is actually surgical: Where is Sarah thy wife? And he said, Behold, in the tent. And He said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son.

Then Genesis gives us one of the most humanizing verses in all of Scripture. Sarah heard it in the tent door behind Him. And Abraham and Sarah were old and well stricken in age, and it ceased to be with Sarah after the manner of women. Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?

Sarah's laugh was not blasphemy. It was arithmetic. It was the sound a woman makes when a promise she once believed has been outlived by her own biology. Twenty-five years earlier, when God first spoke about descendants like the stars, she was in her sixties, and hope had a plausible runway. Now she is eighty-nine, decades past the point where any doctor, any neighbor, any reasonable person would keep the nursery. She had already tried to help God meet the deadline through Hagar, and that improvisation had produced a household of grief. So when the promise resurfaces at ninety, something in her breaks into a laugh, and I want you to hear how much of that laugh is grief. Some laughter is not unbelief; it is the scar tissue that grows over a hope that got tired of standing up.

Some laughter is not unbelief; it is the scar tissue that grows over a hope that got tired of standing up.

And into that laugh comes the question that hangs over every waiting room in the world: Is any thing too hard for the Lord?

Is any thing too hard for the LORD?

The Hebrew behind "too hard" carries the sense of something extraordinary, wonderful, beyond reach. And God's question is not a rebuke about the laughing; it is a reframing of the math. Sarah was calculating from her body; God was calculating from His nature. She was consulting the resources; He was announcing the Resource. Every discouragement you carry is the result of running the numbers with the wrong variables in the equation. When you compute your future from your capacity, your age, your bank balance, your history, your health, you will always arrive at Sarah's laugh. Put God in the equation as more than a footnote, and the entire outcome changes.

Then comes the detail that anchors the whole theme of timing: At the time appointed I will return unto thee, according to the time of life, and Sarah shall have a son. At the time appointed. Not soon. Not eventually. Appointed. Heaven runs an appointment book, and while you have been calling it a delay, God has been calling it a date. And note the tenderness in the phrase "the time of life," a full year later, the natural season of gestation. God did not skip the process; He sanctified it.

You have been calling it a delay. God has been calling it a date.

This is where Hebrews 13 walks in and gives us the posture for the waiting: Let your conversation be without covetousness; and be content with such things as ye have: for He hath said, I will never leave thee, nor forsake thee. Look at the logic of that verse, because it is not the logic we usually preach. The writer does not ground contentment in the sufficiency of your circumstances. He grounds it in the constancy of God's presence. Be content, not because you have enough things, but because you cannot be abandoned. Covetousness, at root, is the suspicion that God's presence is not enough to cover the gap between what you have and what you wanted; contentment is the settled confidence that the Giver Himself is the larger portion.

The Greek in that promise is famously emphatic, stacking negatives one on top of another until the sentence practically shouts: I will never, no, not ever, leave you; I will never, no, not ever, forsake you. God buried that promise in the negatives so that no season of silence could dig it up.

So hear this if you are in a long delay: contentment is not the surrender of your promise; it is the refusal to be tortured by its timing. Sarah's problem was never her age; God had already demonstrated that biology submits to His word. Her problem, and ours, is the assumption that a promise not yet fulfilled is a promise now impossible. Do not let the calendar preach to you. A promise from an unchanging God does not age; only the person holding it does, and He can fix that too.

A promise from an unchanging God does not age; only the person holding it does, and He can fix that too.

III. God Never Changed and Will Not Change: The Helper Who Cannot Be Revised

Which brings us to the bedrock, the third and final movement, and to the sentence that stands over the door of Hebrews 13: Jesus Christ the same yesterday, and to day, and for ever.

Now examine the context in which that verse was written, because it was not composed on a peaceful morning by a comfortable man. Hebrews was written to believers whose leaders had died, whose property had been plundered, whose fellow saints were in prison, and who were being tempted, hour by hour, to go back to what felt safe. The verse right before it says: remember them which have the rule over you, who have spoken unto you the word of God: whose faith follow, considering the end of their conversation. Translation: your leaders are gone. The generation that discipled you has finished its course. And immediately, before that grief can metastasize into panic, the writer says: but Jesus Christ is the same yesterday, today, and forever.

Do you see the pastoral genius of it? People change. Leaders die. Institutions shift. Friends relocate. Health declines. Economies swing. Governments rise and rot. The writer looks at a congregation watching everything solid dissolve and says: there is one Person in your life whose character has not been revised, whose promises have not been renegotiated, and whose power has not depreciated. Everything else in your world is on a timeline. He alone is on a throne.

And here is where the two texts fuse into one revelation. The visitor at Abraham's tent, the One who asked "is anything too hard for the Lord?" and kept the appointment, is the same God who told Joshua "I will not fail thee nor forsake thee," the same God who told Israel through Malachi "I am the Lord, I change not," the same Christ whom Hebrews declares unchanging, and the same Lord standing at whatever door you are sitting in today. The immutability of God is not an abstract doctrine for seminaries. It is the most practical asset a suffering saint possesses. It means:

• The God who appeared to Abraham unbidden still takes the initiative toward people who are not looking for Him. His grace has not grown selective with age.
• The God who kept an appointed time with a ninety-year-old woman still keeps appointments. His calendar has not gotten crowded.
• The God who fed a stranger's need through Abraham's tent still works His providence through ordinary hospitality. His methods have not gone obsolete.
• The God who said He would never leave has not amended the contract, because a God who does not change cannot renege.

That is why the writer draws the conclusion in the boldest possible language: so that we may boldly say, The Lord is my helper, and I will not fear what man shall do unto me. Boldly. Not timidly, not hopefully, not tentatively. The unchanging nature of God is the ground of holy boldness. If God's help fluctuated with His mood, your confidence would have to fluctuate with your circumstances. But He does not fluctuate, so your confession does not have to.

And notice the tense of that confession: the Lord is my helper. Present tense, before the deliverance has arrived. Faith does not wait until the rescue to name the Rescuer. Abraham's visitors came before the son. Hebrews' promise came before the persecution ended. The confession is made in the tent door, not at the baby shower.

IV. Standing in the Door

So here is where we finish, at the doorway where we started.

Abraham sat in a tent door in the heat of the day, ninety-nine years old, holding a promise that had outlived every reasonable expectation, and God came anyway, unannounced, at the worst hour of the day, wearing the disguise of an interruption. And the old man ran.

Sarah stood behind that same door with a laugh in her mouth and a grief behind the laugh, and God did not scold her out of the promise; He simply asked her whether anything was too hard for Him, and then kept an appointment her body had declared impossible. A year later, she held a boy named Laughter, because the God who hears your bitter laugh can turn it into your child's name.

And a battered congregation, generations later, watching their leaders buried and their property seized, was handed a single unshakable sentence to build a life on: Jesus Christ the same yesterday, and today, and forever.

So make the first move, knowing it is never actually first. God has already appeared at your tent door; the cross is the proof that the initiative was always His. But do not sit in the shade of that grace. Run. Feed somebody. Open your home. Show up for the stranger, remember the imprisoned, honor the marriage bed, love the brethren. You may be entertaining more than you know.

Be content, not because your circumstances have finally cooperated, but because the One who cannot leave you is standing in the room. Stop letting the calendar cross-examine the promise. Your delay has a date on it, and heaven does not miss appointments.

And when everything around you is changing, when the leaders you trusted are gone and the ground you stood on is moving, plant your feet on the one Person who has never been amended. He was the visitor at Mamre. He is the helper in Hebrews. He is the same today as He was on the best day of your life, and He will be the same on the day you need Him most.

The Lord is my helper.

Say it in the tent door. Say it before the son arrives. Say it while you are still laughing through the tears.

He has not changed. He will not change. And He is already on the road toward you.

Amen.