What Is Faith in the Bible? Hebrews 11 and Beyond
Faith is probably the most central word in Christianity, and one of the most vague. The Bible is surprisingly specific about what it means.
"Faith" appears hundreds of times in Scripture. But what does the Bible actually mean by it? Not the general cultural sense of "believing something without proof", the Bible's concept of faith is richer, more active, and more grounded than that.
Hebrews 11:1, The only formal definition of faith in the Bible
"Now faith is assurance of things hoped for, proof of things not seen."
Hebrews 11:1 (WEB)
This is the only verse in the Bible that explicitly defines faith, and it's worth unpacking carefully. Two words carry the weight: confidence (hypostasis in Greek, substance, foundation, that which stands under) and assurance (elegchos, evidence, proof, conviction).
The Greek words are not sentimental. Hypostasis was a legal and commercial term, the title deed to a piece of property. Faith, in this framing, is not optimistic feeling. It's treating something not yet visible as if it already exists because the one who promised it is trustworthy.
The rest of Hebrews 11 is then a roll call of people who lived exactly this way, Abel, Noah, Abraham, Moses, Rahab. The author's point is that faith is not a new idea. It's the posture every person in the biblical story who pleased God operated from.
Read the full chapter: Hebrews 11.
Romans 4, Abraham as the model of faith
"Besides hope, Abraham in hope believed, to the end that he might become a father of many nations, according to that which had been spoken, “So will your offspring be.” Without being weakened in faith, he didn’t consider his own body, already having been worn out, (he being about a hundred years old), and the deadness of Sarah’s womb. Yet, looking to the promise of God, he didn’t waver through unbelief, but grew strong through faith, giving glory to God,"
Romans 4:18-20 (WEB)
Paul uses Abraham in Romans 4 to make a precise argument: Abraham was counted righteous before he was circumcised, which means his right standing with God came through faith, not religious performance. This matters because it means faith, not law-keeping, is the fundamental basis of the relationship between God and his people.
But the passage also shows what faith looks like in practice. Abraham "faced the fact" that his body was as good as dead. Paul doesn't present Abraham as someone who ignored reality, he looked at the evidence against the promise and chose to trust the one who made it anyway. That combination, clear-eyed about the situation, but trusting the character of God above the circumstances, is what the Bible calls faith.
Read: Romans 4.
James 2:14-26, Faith without works is dead
"What good is it, my brothers, if a man says he has faith, but has no works? Can faith save him? Even so faith, if it has no works, is dead in itself."
James 2:14,17 (WEB)
James is often set against Paul, Paul says we're justified by faith, James says faith without works is dead. The apparent contradiction dissolves when you understand what each is arguing against. Paul is opposing the idea that religious performance earns standing with God. James is opposing the idea that intellectual assent to correct doctrine is sufficient.
James's point is that genuine faith produces action. He uses Abraham again (v21-23), Abraham's faith was "made complete" by his action of offering Isaac. The faith was real before the action; the action revealed that it was real. This is not salvation by works. It's the recognition that genuine faith changes behavior.
The famous line "even the demons believe, and shudder" (v19) makes the point sharply. Demons have accurate theology. They know who Jesus is. But that knowledge produces fear, not trust and obedience. Merely correct beliefs without transformed life is not what the Bible means by faith.
Read: James 2.
Mark 9:24, Faith and doubt together
"Immediately the father of the child cried out with tears, “I believe. Help my unbelief!”"
Mark 9:24 (WEB)
This single verse may be the most honest prayer in the New Testament. A father brings his son to Jesus for healing and Jesus says faith is required. The father's response is not confident declaration, it's an admission of mixed experience: belief and unbelief coexisting in the same moment.
Jesus heals the boy anyway. The passage suggests that faith doesn't require the absence of doubt. It requires honest orientation toward God, even when that honesty includes "I'm not sure I fully believe this." The father's prayer is a model because it's directed to the right person, honestly and without pretense.
Read the full context: Mark 9.
Ephesians 2:8-9, Faith as gift, not achievement
"for by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, that no one would boast."
Ephesians 2:8-9 (WEB)
Paul's point here is precise: the whole package, grace, salvation, faith, is not self-generated. Faith is not a human achievement that earns something from God. It is itself part of what God gives. This collapses any version of faith that makes it into a spiritual performance or a required quantity you have to produce before God will act.
The practical implication is that struggling to believe is not necessarily a failure of will. It may simply be the acknowledgment that faith, like everything else in the Christian life, comes from God.
Read: Ephesians 2.
What the Bible means by faith, a summary
- ✦Faith is trust, not just belief. It's treating God's word as reliable enough to act on, not merely agreeing that it might be true.
- ✦Faith is compatible with doubt. Mark 9:24 and the Psalms show that honest faith doesn't require the elimination of uncertainty.
- ✦Faith produces action. James makes clear that faith that doesn't change anything isn't the biblical kind.
- ✦Faith is directed at a person. It's not faith in faith, or faith in a doctrine, it's trust in the God who made promises and has a track record of keeping them.
- ✦Faith is given, not manufactured. Ephesians 2 grounds it in grace, which means you can ask for it, rather than just trying harder.
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Key Bible Verses on Faith
“Now faith is assurance of things hoped for, proof of things not seen.”
This verse defines faith as a deep assurance in what we hope for and a firm conviction in the unseen. It encapsulates the essence of trusting God even when we cannot perceive His plans.
“He said to them, “Because of your unbelief. For most certainly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.”
Jesus teaches His disciples that even a small amount of genuine faith can achieve the seemingly impossible. This verse highlights the power of faith and its ability to bring about profound change.
“for we walk by faith, not by sight.”
This verse emphasizes the principle of living in faith rather than relying solely on what we can see with our eyes. It encourages believers to trust in God's guidance, despite the uncertainties of life.
“So faith comes by hearing, and hearing by the word of God.”
Faith is presented as something that develops through listening to God's word. This highlights the importance of scripture in fostering a strong faith that trusts in God's promises.
“But let him ask in faith, without any doubting, for he who doubts is like a wave of the sea, driven by the wind and tossed.”
This passage illustrates the necessity of unwavering faith when seeking God's guidance. It warns that doubt can destabilize our faith and hinder our relationship with God.
“Jesus said to him, “If you can believe, all things are possible to him who believes.”
In this verse, Jesus stresses the limitless possibilities that come with belief. It serves as a reminder that faith in Him can lead to miraculous outcomes and transformations.
“I can do all things through Christ, who strengthens me.”
This verse emphasizes that faith in Christ provides the strength needed to face any challenge. It reassures believers that their capabilities are rooted in their relationship with Jesus.
“for by grace you have been saved through faith, and that not of yourselves; it is the gift of God,”
This verse underscores the role of faith in salvation, asserting that it is a gift from God rather than a result of human effort. It highlights the foundational aspect of faith in the Christian belief system.
More verses about Faith (WEB)+
30 further passages this study and its cross-references point to, in the World English Bible. Each one opens its chapter.
- 1 Peter 1:3“Blessed be the God and Father of our Lord Jesus Christ, who according to his great mercy caused us to be born again to a living hope through the resurrection of Jesus Christ from the dead,”
- Hebrews 6:11-12“We desire that each one of you may show the same diligence to the fullness of hope even to the end, that you won’t be sluggish, but imitators of those who through faith and perseverance inherited the promises.”
- James 3:5“So the tongue is also a little member, and boasts great things. See how a small fire can spread to a large forest!”
- Jeremiah 29:11“For I know the thoughts that I think toward you,” says Yahweh, “thoughts of peace, and not of evil, to give you hope and a future.”
- Hebrews 12:2“looking to Jesus, the author and perfecter of faith, who for the joy that was set before him endured the cross, despising its shame, and has sat down at the right hand of the throne of God.”
- Ephesians 4:4“There is one body, and one Spirit, even as you also were called in one hope of your calling;”
- Romans 12:2“Don’t be conformed to this world, but be transformed by the renewing of your mind, so that you may prove what is the good, well-pleasing, and perfect will of God.”
- Colossians 2:9-10“For in him all the fullness of the Deity dwells bodily, and in him you are made full, who is the head of all principality and power;”
- Isaiah 45:5“I am Yahweh, and there is no one else. Besides me, there is no God. I will strengthen you, though you have not known me;”
- Philippians 2:5-7“Have this in your mind, which was also in Christ Jesus, who, existing in the form of God, didn’t consider equality with God a thing to be grasped, but emptied himself, taking the form of a servant, being made in the likeness of men.”
- Galatians 3:11“Now that no man is justified by the law before God is evident, for, “The righteous will live by faith.””
- 2 Peter 1:3“seeing that his divine power has granted to us all things that pertain to life and godliness, through the knowledge of him who called us by his own glory and virtue;”
- Isaiah 52:7“How beautiful on the mountains are the feet of him who brings good news, who publishes peace, who brings good news, who proclaims salvation, who says to Zion, “Your God reigns!””
- Matthew 10:28“Don’t be afraid of those who kill the body, but are not able to kill the soul. Rather, fear him who is able to destroy both soul and body in Gehenna.”
- Hebrews 3:14“For we have become partakers of Christ, if we hold fast the beginning of our confidence firm to the end:”
- Luke 24:46-47“He said to them, “Thus it is written, and thus it was necessary for the Christ to suffer and to rise from the dead the third day, and that repentance and remission of sins should be preached in his name to all the nations, beginning at Jerusalem.”
- Luke 11:28“But he said, “On the contrary, blessed are those who hear the word of God, and keep it.””
- Titus 3:5“not by works of righteousness which we did ourselves, but according to his mercy, he saved us through the washing of regeneration and renewing by the Holy Spirit,”
- 2 Corinthians 4:6“seeing it is God who said, “Light will shine out of darkness,” who has shone in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ.”
- Ephesians 1:5“having predestined us for adoption as children through Jesus Christ to himself, according to the good pleasure of his desire,”
- Hebrews 10:12“but he, when he had offered one sacrifice for sins forever, sat down on the right hand of God;”
- Luke 6:27““But I tell you who hear: love your enemies, do good to those who hate you,”
- Mark 16:15“He said to them, “Go into all the world, and preach the Good News to the whole creation.”
- Mark 11:17“He taught, saying to them, “Isn’t it written, ‘My house will be called a house of prayer for all the nations?’ But you have made it a den of robbers!””
- Luke 17:19“Then he said to him, “Get up, and go your way. Your faith has healed you.””
- Romans 4:3“For what does the Scripture say? “Abraham believed God, and it was accounted to him for righteousness.””
- Luke 18:14“I tell you, this man went down to his house justified rather than the other; for everyone who exalts himself will be humbled, but he who humbles himself will be exalted.””
- Romans 8:1“There is therefore now no condemnation to those who are in Christ Jesus, who don’t walk according to the flesh, but according to the Spirit.”
- John 3:16“For God so loved the world, that he gave his one and only Son, that whoever believes in him should not perish, but have eternal life.”
- 2 Corinthians 5:17“Therefore if anyone is in Christ, he is a new creation. The old things have passed away. Behold, all things have become new.”
Common Questions About Faith
What is faith according to the Bible?+
According to Hebrews 11:1, faith involves a confident assurance in what we hope for and a firm conviction about things we cannot see. It is not just a vague feeling or wishful thinking, but a strong trust in God's character and promises. As 2 Corinthians 5:7 explains, this means living by faith rather than relying solely on what is visible.
How can I grow my faith?+
Romans 10:17 highlights that faith grows through hearing the word of Christ, suggesting that regular engagement with Scripture is essential for spiritual nourishment. Additionally, James 1:6 emphasizes that faith is strengthened when exercised through prayer, encouraging believers to ask God without doubting and to trust in His faithfulness.
What did Jesus say about having small faith?+
Jesus encouraged those with small faith. In Matthew 17:20, he explained that faith as small as a mustard seed can move mountains, emphasizing that the power comes from the greatness of God, not the size of one's faith. In Mark 9:23, he assured a father that all things are possible for those who believe, acknowledging the father's honest plea for help with his unbelief.
Are we saved by faith or by good works?+
Scripture makes it clear that salvation is by grace through faith, as stated in Ephesians 2:8. This passage emphasizes that salvation is a gift from God, not something we can achieve on our own. While good works are important, they are the result of salvation, not the cause. Genuine faith naturally leads to a transformed life.
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