What does the Greek word pistis mean in the Bible?

Key facts

• Pistis (πίστις) is the noun translated "faith", pisteuō (πιστεύω) is the verb translated "believe", and pistos (πιστός) is the adjective translated "faithful". All three come from the same root. [Strong's Exhaustive Concordance, G4102, G4100, G4103]
• The standard New Testament lexicon gives pistis a range that includes faithfulness or reliability, trust or confidence, and that which is believed. [BDAG, 'πίστις']
• In Greek usage before and around the New Testament, pistis was an ordinary word for trust and good faith in military, legal and commercial settings. It was not mainly a religious term. [Morgan, Roman Faith and Christian Faith, 2015]
• Pistis can mean "faithfulness". In Galatians 5:22, pistis appears in the list of the fruit of the Spirit, where the NIV translates it "faithfulness". [NA28, Galatians 5:22]
• When the New Testament quotes Habakkuk 2:4 ("the righteous will live by faith"), it uses pistis for the Hebrew emunah (אֱמוּנָה), a word meaning firmness and faithfulness. [Romans 1:17; Galatians 3:11; Hebrews 10:38; BDB, 'אֱמוּנָה']
• The Latin Bible rendered pistis as fides, and English "faith" comes from fides. [Morgan, 2015; The Weight of God, Ch. 5]
• Matthew W. Bates argues that pistis, used of the gospel, is better rendered "allegiance" than "belief". [Bates, Salvation by Allegiance Alone, 2017]
• N. T. Wright reads Paul's use of pistis against the background of covenant faithfulness. [Wright, Paul and the Faithfulness of God, 2013]
• The Weight of God defines pistis as "structural weight-bearing reliance on a person assessed as reliable". [The Weight of God, Key Terms]

Key terms

pistis πίστις

trust, reliance, faithfulness; the New Testament noun translated "faith"

pisteuō πιστεύω

to trust, to rely on, to believe; the verb form of pistis

pistos πιστός

faithful, trustworthy, reliable; used of God in 1 John 1:9

apistia ἀπιστία

lack of trust; unbelief

fides (Latin)

the word the Latin Bible used to translate pistis; the source of English "faith"

Explanation

The word and its family

Pistis belongs to a small group of related Greek words. The noun pistis is usually translated "faith". The verb pisteuō is usually translated "believe". The adjective pistos means "faithful" or "trustworthy". The negative forms, apistia (ἀπιστία) and apistos (ἄπιστος), mean "unbelief" and "unbelieving". Because English uses two unrelated words, "faith" and "believe", readers often miss that the Greek has one word family. When the New Testament says "believe", it is using the verb form of the same word it uses for "faith".

What the lexicons say

BDAG, the standard academic lexicon of New Testament Greek, gives pistis three main areas of meaning. First, faithfulness or reliability: the quality in someone that earns trust. Second, trust or confidence: the stance of a person who relies on someone. Third, the content of what is believed, as in "the faith". The first two are relational. They describe a bond between a person who trusts and a person who is trusted. The Weight of God summarises the lexical picture in these terms: "The lexicons define pistis as trust, reliance, and entrusting oneself to another in complete confidence."

One word covers both sides of that relationship. God is pistos (faithful), and a person shows pistis (trust) toward God. In 1 John 1:9, the word translated "faithful" is pistos.

Pistis before it was a religious word

Teresa Morgan's Roman Faith and Christian Faith (Oxford, 2015) traces pistis and its Latin equivalent, fides, in the Greek and Roman world. Her work shows the word in everyday use: between soldiers and commanders, in contracts and business dealings, in oaths and legal relationships. In those settings pistis meant trusting someone enough to act on it, often at personal risk. The Weight of God (Ch. 5) builds on this background. It argues that the apostles chose an everyday word whose meaning their readers already knew from ordinary life.

Trust, faithfulness and allegiance

Scholars describe the relational core of pistis in different ways. Matthew W. Bates (Salvation by Allegiance Alone, 2017) argues that "allegiance" to Jesus as king is often a better rendering than "belief". N. T. Wright (Paul and the Faithfulness of God, 2013) links Paul's pistis language to covenant faithfulness. The Weight of God uses a third picture: putting your weight on something. The book notes that its framework differs from Bates in metaphor but reaches the same diagnosis: the modern habit of reducing faith to mental agreement does not match the Greek.

The Hebrew background points the same way. When Paul quotes Habakkuk 2:4, he uses pistis for emunah, a Hebrew word for firmness and steady faithfulness (see What are the Hebrew words for trust and faith? (batach, aman, emunah)).

How pistis became "belief"

The Latin Bible translated pistis as fides, and English "faith" comes from fides. The Weight of God (Ch. 5) argues that the meaning of the word then narrowed in stages: from trust in a person, to assent to a creed, to holding a religious opinion, to a belief held without proof. The book is clear that the Greek manuscripts are unchanged. It argues that what drifted was the meaning of the English words used to translate them. Its short version of the chain runs from pistis to fides, to "faith", to "believe", and finally to "opinion" (Ch. 5). This is the book's account of word history. It is not a sequence that a lexicon sets out.

Where the weight metaphor fits

The Weight of God states plainly that "weight transfer" is its own illustration and not a lexical gloss: "Weight transfer is my metaphor for what that looks like when you stop abstracting it and start living it." The lexical claim is that pistis means trust, reliance and faithfulness. The weight picture is the book's way of making that meaning concrete. It treats faith as something a person does, not only something a person thinks.

Common misunderstandings

• "Faith means believing something without evidence." In New Testament Greek, pistis is trust in someone judged reliable. Hebrews 11:1 even describes it with the word elegchos, which means proof or evidence (see What does Hebrews 11:1 mean? (hypostasis and elegchos) and Is faith blind? Is Christian faith belief without evidence?).
• "Pistis is a special religious word." It was an ordinary word in contracts, oaths, military life and commerce before the New Testament used it (Morgan, 2015).
• "Faith and faithfulness are different ideas." In Greek they are the same word. Galatians 5:22 uses pistis for "faithfulness".
• "Believing is a separate idea from faith." "Believe" (pisteuō) is simply the verb form of pistis ("faith").
• "Agreeing that God exists is pistis." James 2:19 says the demons also believe that God is one. The New Testament distinguishes believing that something is true from trusting a person (see Why does the New Testament say "believe into" Jesus? (pisteuō eis, John 3:16) and What does "even the demons believe" mean in James 2:19?).

What the book argues

The Weight of God: How to Believe (Matthew Wong, 2026) argues that pistis means "structural weight-bearing reliance on a person assessed as reliable" (Key Terms), and that this is the core mechanism by which a person connects to God (Ch. 1). Its picture is a sleeping child who lets her full weight rest on her father (Ch. 4). In Chapter 3, it ties pistis to the preposition eis ("into") in John 3:16 and reads saving faith as an ongoing transfer of weight onto Jesus, not a single moment of assent. In Chapter 4, it argues that one Greek word, pistis, had to carry three Hebrew words for trust: aman, batach and emunah. In Chapter 5, it traces how pistis narrowed through Latin fides to the modern sense of "opinion". The weight-transfer framework is the book's own distinctive argument. The underlying lexical sense of trust and reliance is standard.

In the book: Chapter 3: Believe; Chapter 4: Childlike Faith; Chapter 5: The Drift; Chapter 8: Something You Cannot Prove.

Sources

1. Arndt, William F., F. Wilbur Gingrich, Frederick W. Danker, and Walter Bauer. A Greek-English Lexicon of the New Testament and Other Early Christian Literature, 3rd ed. (BDAG). Chicago: University of Chicago Press, 2000. Entries 'πίστις', 'πιστεύω'.
2. Thayer, Joseph Henry. Thayer's Greek-English Lexicon of the New Testament. Peabody, MA: Hendrickson, 1995 (reprint of 1886 edition).
3. Strong, James. Strong's Exhaustive Concordance of the Bible. Nashville: Abingdon Press, 1890. G4100, G4102, G4103.
4. Brown, Francis, S. R. Driver, and Charles A. Briggs. A Hebrew and English Lexicon of the Old Testament (BDB). Oxford: Clarendon Press, 1907. Entry 'אֱמוּנָה'.
5. Morgan, Teresa. Roman Faith and Christian Faith: Pistis and Fides in the Early Roman Empire and Early Churches. Oxford: Oxford University Press, 2015.
6. Bates, Matthew W. Salvation by Allegiance Alone: Rethinking Faith, Works, and the Gospel of Jesus the King. Grand Rapids: Baker Academic, 2017.
7. Wright, N. T. Paul and the Faithfulness of God. Minneapolis: Fortress Press, 2013.
8. Novum Testamentum Graece, Nestle-Aland 28th ed. (NA28).
9. Wong, Matthew. The Weight of God: How to Believe. Australia, 2026. ISBN 978-1-7646297-3-7.