A promise is only as good as the one who makes it. That is why the Bible, before it asks you to lean on any particular promise, first settles the character of the Promiser — and then invites you to put your full weight down. Peter says the promises are the very means by which God’s life gets into ours:
Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust. 2 Peter 1:4
Exceeding great and precious — Peter was not a man given to gushing, and the Holy Spirit does not waste superlatives. What follows is a working set of those promises, arranged by the need each one answers.
Why every promise of God is certain
Start with the foundation. Human promises fail for two reasons: the promiser lied, or the promiser proved unable. Scripture rules out both:
God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good? Numbers 23:19
So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it. Isaiah 55:11
And the record backs the claim. At the end of Israel’s long road into the promised land, the historian files this report:
There failed not ought of any good thing which the LORD had spoken unto the house of Israel; all came to pass. Joshua 21:45
All came to pass. Not most. All. Centuries later, Paul gathers every promise into one Person and stamps them with a double seal:
For all the promises of God in him are yea, and in him Amen, unto the glory of God by us. 2 Corinthians 1:20
In Christ, every promise of God is yea — yes — and Amen — so be it, settled. The cross is God’s proof of intent: having given His Son, He will not haggle over the smaller mercies (that argument is Paul’s own in Romans 8:32). This is why the writer to the Hebrews can say, “Let us hold fast the profession of our faith without wavering; (for he is faithful that promised;)” (Hebrews 10:23). The anchor is not the strength of your grip but the faithfulness of the Promiser.
Promises of His presence
The promise beneath all the others — the one God repeats most often, to the fearful most of all:
Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness. Isaiah 41:10
Be strong and of a good courage, fear not, nor be afraid of them: for the LORD thy God, he it is that doth go with thee; he will not fail thee, nor forsake thee. Deuteronomy 31:6
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. Hebrews 13:5
“I will never leave thee, nor forsake thee” — in the Greek the negatives pile up five deep, as if God were saying never, no never, no never. And the risen Christ’s last recorded words in Matthew’s Gospel make the promise personal to every disciple to the end of history: “lo, I am with you alway, even unto the end of the world” (Matthew 28:20).
Promises of provision and wisdom
But my God shall supply all your need according to his riches in glory by Christ Jesus. Philippians 4:19
Mark the measure: not out of His riches, like a millionaire tossing a coin, but according to them — supply proportioned to infinite wealth. The promise covers need, not greed; but for need it has no ceiling. When what you lack is wisdom rather than bread:
If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him. James 1:5
Upbraideth not — He does not scold you for asking. And when you cannot see how any of it fits together:
And we know that all things work together for good to them that love God, to them who are the called according to his purpose. Romans 8:28
Not “all things are good” — the Bible never says that — but all things work together for good, the way flour, salt, and fire are not bread until the baker is done with them. If suffering has you questioning this promise, I have handled it with care in Why Does God Allow Suffering?
Promises of forgiveness and rest
The pair of promises every burdened conscience needs most:
If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. 1 John 1:9
Come unto me, all ye that labour and are heavy laden, and I will give you rest. Matthew 11:28
Notice that 1 John 1:9 does not say God is merely merciful to forgive — He is faithful and just to do it, because the debt was truly paid at the cross and justice itself now stands on the side of your pardon. If you doubt that your particular sin is covered, read Can God Forgive Me? — and take the promise of John 3:16 at its full width: whosoever believeth in him should not perish, but have everlasting life (John 3:16). Whosoever includes you.
Promises for trouble, temptation, and weariness
Many are the afflictions of the righteous: but the LORD delivereth him out of them all. Psalm 34:19
An honest promise — it concedes the afflictions will be many before it promises deliverance from all. God pledges no exemption from trouble; He pledges Himself in it and a way through it:
There hath no temptation taken you but such as is common to man: but God is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear it. 1 Corinthians 10:13
But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint. Isaiah 40:31
Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee. Isaiah 26:3
In the Hebrew, “perfect peace” is literally peace, peace — shalom doubled. The mind stayed on Him is a mind propped up like a leaning wall, held from outside itself. For the fight against a besetting temptation, 1 Corinthians 10:13 belongs on your wall; How to Overcome Habitual Sin shows how to use it in the actual moment of battle.
The promise at the end of the road
In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also. John 14:2–3
If it were not so, I would have told you — Jesus stakes His honesty on heaven. And John was shown how the promise ends:
And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away. Revelation 21:4
Every promise in this guide is a downpayment on that one. What heaven holds — and the reunion question everyone asks — is the subject of What Is Heaven Like?
How to stand on a promise
The old believers spoke of “pleading the promises,” and the practice is worth recovering. Find the promise that fits your need — presence for fear, provision for want, pardon for guilt, strength for weariness — and write it where you will see it. Pray it back to God in His own words: “Lord, You said You would never leave me — I am holding You to that today.” God loves to be reminded of His word; He wrote it down precisely so we could. Check the address — some promises are to Israel, some to the church, some universal; read the surrounding verses so you claim what is truly yours (How to Study the Bible shows you how context works). And wait without wavering — Hebrews 10:23 ties holding fast to the faithfulness of the Promiser, not the speed of the answer. Abraham waited twenty-five years for Isaac; the promise was never in doubt for a single one of them. If assurance itself is your struggle — whether the promises apply to you — How Can I Know I’m Truly Saved? was written for exactly that fear.