What is faith according to the Bible?
Short answer
Faith, in the Bible, is trust placed in someone — not certainty, and not optimism. Hebrews 11:1 defines it in terms of what is hoped for and what stays out of sight. In the texts it almost always comes tied to an action: Abraham leaves without knowing where, and the letter of James refuses a faith that produces nothing.
- Written by
- Raphael Navarro Schmitt
- Reviewed by
- Maria Luisa Navarro Schmitt
- Published on
- Reading time
- 3 min read
It helps to start with what the word does not mean. Faith, in biblical vocabulary, is not believing something without reason, and it is not the opposite of thinking. The Greek term pistis belongs to the field of trust and loyalty — it is what exists between people who count on one another, and it was also used for fidelity to a commitment. That is why the texts speak far more about trusting someone than about agreeing with a statement. The difference between those two things changes everything in the reading.
Hebrews 11 carries the formulation closest to a definition, and the interesting part is what the chapter does immediately afterwards. Instead of developing the idea, it starts listing people — and each one appears doing something. Abraham leaves home with no address; others build, cross, wait, hold out. The chapter defines faith in one abstract sentence and spends the rest of its space refusing to leave it abstract.
It is also worth saying, because many people arrive here carrying guilt about it: doubt does not disqualify faith. The clearest case is in Mark 9, where a father states that he believes and, in the same breath, asks for help with his own unbelief. The contradiction stays in the text unrepaired, and the request is granted anyway. Biblical faith is not the absence of questions — it is the decision to keep trusting while the questions stay open.
That leaves the point where the Christian traditions read differently, and it is an old one: how faith and what a person does fit together. Paul insists that salvation is a gift and not an achievement; James states that a faith with no corresponding work is dead. No tradition discards either text — Catholics and Protestants affirm both and describe the relationship between them in distinct ways, a discussion that spans centuries and that this page does not arbitrate. What the two authors share is simpler than the controversy suggests: for both, faith is something that shows up in the life of the person who has it.
What the passages say
1Now, faith is the substance of things hoped for, the evidence of things not apparent.
The closest thing to a definition the Bible offers, and it has two elements: something hoped for and something not visible. Neither of them speaks of an absence of evidence — in fact this edition uses the word evidence for faith itself. Both speak of time and of visibility, which is a different question.
8By faith, the one called Abraham obeyed, going out to the place that he was to receive as an inheritance. And he went out, not knowing where he was going.
The first example the chapter gives after defining, and it is a change of address with no destination address. Faith appears described as displacement, not as a mental state — the verb that accompanies it is obey, and what follows is leaving home.
23And immediately the father of the boy, crying out with tears, said: “I do believe, Lord. Help my unbelief.”
A man states that he believes and asks for help with his own unbelief in the same breath. The text does not fix the contradiction and the request is not refused. For anyone who thinks doubt invalidates faith, this verse settles the matter on its own. Note the numbering: in this edition the line falls at verse 23, one earlier than in most Bibles.
8For by grace, you have been saved through faith. And this is not of yourselves, for it is a gift of God.
9And this is not of works, so that no one may glory.
Where Paul places the origin of faith outside the merit of the believer: a gift received, not a performance. The argument has an explicit target in the following clause — to stop anyone using their own faith as grounds for boasting.
17Thus even faith, if it does not have works, is dead, in and of itself.
The counterweight that fed centuries of debate: a faith that produces nothing is described as dead. Worth reading the whole letter before setting James against Paul — his subject is a community treating the poor and the rich differently, and the claim is born of that concrete accusation.