By Duke Taber
There is a word that shows up on church signs, coffee mugs, and inspirational posters. A word that gets passed around in conversations, tossed out in prayers, and treated like a spiritual password. And yet, for all its visibility, a surprising number of Christians have never stopped to ask what it actually means.
What is faith?
Not faith as a feeling. Not faith as an attitude of general optimism. Not faith as a synonym for religious activity. But faith as the Bible defines it — as a living, active, anchoring trust in the God who exists and who is faithful to every promise he has ever made.
This question matters more than most of us realize. I have sat with people in some of the hardest seasons of their lives — hospital waiting rooms, grief, financial collapse, broken marriages — and I have watched the difference between those whose faith was rooted in something solid and those whose faith was rooted in a feeling. One group could be shaken but not swept away. The other had little to hold onto when the storm came. The difference was not the size of their faith. It was whether their faith was directed at something real.
Why the World’s Version of Faith Won’t Hold You
Before we can understand what faith is, we need to name what it isn’t, because the culture around us has given us a convincing counterfeit.
The secular version of faith is something like this: when the evidence runs out and your plans fall apart, you take a “leap of faith” — a blind jump into the unknown, driven by hope that things will somehow work out. Faith, in this framing, is what you fall back on when reason fails. It’s positive thinking with religious language. It asks you to believe something despite the absence of evidence, or even in contradiction to it.
That version of faith will not hold you.
Faith is not believing in your heart what your mind otherwise tells you isn’t true. Faith is not trusting in something for which there are no facts. Faith is not an existential blind leap into the dark. Faith is not the opposite of knowledge. Faith is not the enemy of reason.
The biblical writers understood something that our culture has largely forgotten: genuine faith is not irrational. It is not a suspension of the mind. It is, instead, a confident trust in the character and promises of a God who has proven himself faithful — proven it in history, in Scripture, and in the lives of everyone who has ever truly called on his name.
What the Bible Actually Says
The clearest and most foundational definition of faith in all of Scripture comes from the book of Hebrews:
“Now faith is the substance of things hoped for, the evidence of things not seen.” — Hebrews 11:1 (NKJV)
This verse rewards more than a quick read. The word translated “substance” is the Greek hypostasis, which carries the meaning of a foundation, a title deed, a settled reality. And “evidence” — the Greek elegchos — means proof or conviction, the kind of certainty that holds up under examination.
The word “hope” as used by the author of Hebrews describes that which is certain but not yet possessed. For the author of Hebrews, one’s hope is the settled belief and conviction of what is true and certain, which therefore produces firm assurance that what God has promised to do in the future is as sure as that which He has already accomplished in the past.
In other words, faith is not wishful thinking about things you’d like to be true. It is the firm grip on what God has already declared to be true — realities that exist beyond what your natural eyes can see, but no less real for that. Faith lays hold of the promises of God as if they were already in your hand.
The central feature of faith at work is confidence or trust. Faith is not an abstract idea, but a central biblical doctrine. It is a confident trust in God as revealed in Scripture and his promises.
This is the definition that can hold you when life gets hard.
Faith Has Three Dimensions
Christian theologians have long recognized that saving faith is not a single thing but a unity of three inseparable elements. Knowing these can help you examine your own faith and give you language for the person who asks why you believe what you believe.
Knowing (Notitia)
Faith begins with knowledge. You cannot trust in a God you know nothing about. You cannot cling to promises you’ve never heard. The essence of Christian faith is reliance on the person, work, and promises of Jesus Christ. Reliance means to depend on or to count on him. Jesus is a living person with certain character qualities. He has also done things on our behalf. Faith requires knowing who he is and what he has done.
This is why the Bible calls us to study, to meditate on Scripture, to know the content of what we believe. A deep-dive Bible study on faith is not spiritual extra credit — it is how you build the kind of knowing that sustains trust.
Agreeing (Assensus)
Knowledge alone is not faith. James reminds us that the demons know who God is. They have correct theology about Jesus. And they shudder. Intellectual acknowledgment of the facts — even correct acknowledgment — does not constitute saving faith.
Faith requires that you move from knowing to agreeing, from awareness to personal assent. You affirm that what God has said is true, not just as a matter of fact, but as a matter that concerns you directly. The gospel is not merely an interesting historical claim. It is true. And it is true for you.
Trusting (Fiducia)
This is the decisive and irreducible heart of faith — personal trust. Not just knowing about Jesus, not just agreeing that he is who he says he is, but committing yourself to him. Resting your full weight on his finished work. Depending on him as a living person rather than a dead proposition.
“For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.” — Ephesians 2:8–9 (NKJV)
This trust is never passive. It moves. It acts. It obeys. Which brings us to the question that every believer must eventually face.
The Hard Question: Does Faith Work?
The book of James is where faith gets tested. Not in a classroom or a sermon, but in the messy, daily, concrete circumstances of your actual life.
“Thus also faith by itself, if it does not have works, is dead.” — James 2:17 (NKJV)
This verse has made people nervous for centuries, sometimes because it seems to contradict Paul’s insistence that we are saved by faith and not by works. But James and Paul are not in disagreement. They are describing the same living faith from two different angles.
These verses aren’t a contrast between faith and works. They’re a contrast between true faith and false faith.
Paul is speaking about the source of salvation — it comes through faith, not by earning it through religious performance. James is speaking about the evidence of salvation — genuine faith is always accompanied by transformation. It always moves the person who possesses it. It always produces something visible.
Faith without works is a dead faith because the lack of works reveals an unchanged life or a spiritually dead heart. True saving faith will result in a transformed life. Works are not the cause of salvation; works are the evidence of salvation. Faith in Christ always results in good works.
Think of it this way: a healthy tree produces fruit. The fruit doesn’t make the tree healthy — the health of the tree produces the fruit. If there is genuinely no fruit, you begin to question whether the tree is actually alive. This is James’s point. Works don’t save you. But if faith is really present, it doesn’t stay invisible.
Faith in the Old Testament and the New
One of the most clarifying questions we can ask is whether faith looks the same across the whole of Scripture. The answer is both yes and no.
The substance of faith — personal trust in the God who reveals himself and makes promises — is identical across both testaments. Abraham believed God, and it was credited to him as righteousness (Genesis 15:6). David declared that the Lord was his shepherd and his rock. The prophets staked their lives on promises that they would never see fulfilled in their lifetimes.
“Your fathers trusted in Me; they trusted, and You delivered them.” — Psalm 22:4 (NKJV)
But in the New Testament, what was shadow becomes substance. The object of faith comes into focus with the sharpest possible clarity.
“Looking unto Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.” — Hebrews 12:2 (NKJV)
Faith is only as powerful as the object of one’s faith. Jesus Christ is the founder and perfecter of our faith, the undeniable evidence of God’s faithfulness to his word.
The Old Testament saints leaned into a promise. We lean into a person — the one who fulfilled the promise and rose from the dead to prove it. This is why faith in the Old Testament and faith in the New Testament share the same root while bearing different fruit.
Faith and Doubt: What to Do When You’re Not Sure
I want to be honest with you here, because I have met very few people who have lived their Christian lives without ever wrestling with doubt. And I want to say plainly: doubt does not disqualify you from faith. In many cases, it is the beginning of a deeper faith.
There is a difference between the doubt that is honest questioning — “God, I believe; help my unbelief!” (Mark 9:24) — and the doubt that is willful rejection. The first kind is addressed throughout Scripture with compassion and patience. The disciples doubted after the resurrection. Thomas required evidence. Peter sank beneath the waves and cried out for rescue.
The Bible study on doubt that I have walked many believers through always returns to the same place: the answer to doubt is not a demand to feel more certain, but a turn toward the object of faith — toward Jesus himself, toward the resurrection, toward the testimony of Scripture and the witness of the church across two thousand years.
Firm “faith” enabled Israel’s forefathers to follow after promises whose fulfillment were on a distant horizon. Faith is about holding fast to Jesus — no matter what. Even though God’s promises at times seem far off, we can be certain that their fulfillment awaits us at the end of life.
What Faith Looks Like in Practice
Here is where many people get stuck. They understand faith theologically — they can quote Hebrews 11:1, they know the three components of faith, they agree that works should follow — but something disconnects between their theology and their daily life. Their faith seems more like a statement they hold than a reality they live.
The faith of Abraham gives us perhaps the clearest practical portrait. He believed God when the evidence for God’s promise made no human sense. He left Ur without knowing where he was going. He waited decades for the promised son. He climbed the mountain with Isaac and trusted that God could raise the dead (Hebrews 11:19). Each of these was not just an internal mental state. Each was an action that flowed from trust.
“And he believed in the LORD, and He accounted it to him for righteousness.” — Genesis 15:6 (NKJV)
Living faith looks like this:
It prays — because trust expresses itself in conversation with the one trusted. Developing a daily prayer practice is not a separate spiritual discipline from faith; it is one of the most natural expressions of it.
It obeys — not perfectly, and not without struggle, but consistently and directionally. A person who genuinely trusts that God is who he says he is will live in accordance with what God has said.
It endures — not because the faithful person feels no fear or grief or exhaustion, but because trust holds even when feelings give way. The examples of unwavering faith in the Bible are not examples of people who felt no doubt. They are examples of people who kept moving toward God even when everything in their circumstances argued against it.
It worships — because the person who truly knows and trusts God cannot help but respond to him. Faith and worship are inseparable. You praise the God you trust and in praising him, your trust deepens.
Faith, Grace, and the One Who Gives Both
There is one more thing to be said, and it may be the most important thing of all.
Faith is not something you produce. It is not a spiritual muscle you develop through sheer discipline. It is not a feeling you generate by trying harder. Faith is, at its root, a gift.
“For by grace you have been saved through faith, and that not of yourselves; it is the gift of God.” — Ephesians 2:8 (NKJV)
The same grace that saves you is the grace that generates and sustains the faith by which you receive that salvation. This means that when your faith is weak — and there will be seasons when it is — the answer is not self-condemnation. The answer is to go back to the source.
When someone is born again, God changes them from the inside out. Works are not a checklist we keep. They come from the Spirit giving us new desires and the power to live differently.
The same is true of faith itself. When yours feels thin, go back to Scripture. Go back to prayer. Go back to the community of believers who can carry you for a season. Go back to the cross and the empty tomb — because everything faith requires is found there.
“Jesus said to him, ‘If you can believe, all things are possible to him who believes.’ Immediately the father of the child cried out and said with tears, ‘Lord, I believe; help my unbelief!'” — Mark 9:23–24 (NKJV)
I have prayed that prayer more times than I can count. It is not a prayer of failure. It is a prayer of honest dependence — exactly the kind of dependence faith is meant to produce.
Growing Your Faith: Where to Go from Here
Faith is not static. It is meant to grow — deepened by trial, sharpened by study, enlarged by answered prayer, and strengthened by community. The Hall of Faith in Hebrews 11 was given to us not as a gallery to admire but as a fellowship to join. These were ordinary people in extraordinary circumstances who chose, again and again, to trust the God who cannot lie.
You are invited into the same faith.
If you are just beginning this journey, start with Scripture. Read it slowly. Let Hebrews 11 become familiar. Sit with Romans 4 and the story of Abraham. Walk through the Gospels and let your knowledge of Jesus become personal, not merely factual.
If you have been walking with God for years but sense that your faith has gone dry and formal, go back to the basics — not because you’ve failed, but because the basics are always fresh. Every season of life deepens your walk with God if you will let it.
And if you are in a hard place right now — wondering where God is, struggling to feel anything, holding on by a thread — hear this: a thread connected to Jesus is enough. He is the author and finisher of your faith. He began it. He will complete it.
“Being confident of this very thing, that He who has begun a good work in you will complete it until the day of Jesus Christ.” — Philippians 1:6 (NKJV)
That confidence is faith. And it is enough.
A Brief Prayer
Lord, I want a faith that is real — rooted not in my feelings or my circumstances, but in who you are and what you have done. Where my faith is thin, strengthen it. Where my knowledge is shallow, deepen it. And where I am trusting in anything other than you, help me see it and let it go. I believe; help my unbelief. Amen.
Take a Step
If you want to go deeper in your understanding of biblical faith, here are a few practical places to begin:
- Start a Bible reading plan focused on faith
- Work through a comprehensive Bible study on faith
- Explore 20 encouraging Scriptures about faith in the NKJV
Resources
- Hebrews 11 Commentary — Sam Storms
- What Does Faith Mean? — Grace Theological Seminary
- What Does Hebrews 11:1 Mean? — Crossway
- Faith: What Does This Word Mean in Hebrews 11? — Logos
- What’s the Deal with Faith and Works in James? — The Gospel Coalition
- Why is Faith Without Works Dead? — GotQuestions.org
Duke Taber
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