Faith in the context of the OT rests on a foundation that the person or object of trust, belief, or confidence is reliable. Trust in Yahweh is expressed through loyalty and obedience. The theme of responsive obedience is emphasized in the Torah (Exod. 19:5). In the later history of Israel, faithfulness to the law became the predominant expression of faith (Dan. 1:8; 6:10). OT faith, then, is a moral response rather than abstract intellect or emotion.

Faith is a central theological concept in the NT. In relational terms, faith is foremost personalized as the locus of trust and belief in the person of Jesus Christ.

In the Gospels, Jesus is spoken of not as the subject of faith (as believing in God), but as the object of faith. In the Synoptic Gospels, faith is seen most often in connection with the ministry of Jesus. Miracles, in particular healings, are presented as taking place in response to the faith of the one in need of healing or the requester. In the Gospel of John, faith (belief) is presented as something that God requires of his people (6:28 29).

In the book of Acts, “faith/belief” is used to refer to Jews and Gentiles converting to following the life and teachings of Jesus Christ and becoming part of the Christian community. The book correlates faith in Christ closely with repentance (Acts 11:21; 19:18; 20:21; 26:18).

Paul relates faith to righteousness and justification (Rom. 3:22; 5:11; Gal. 3:6). In Ephesians faith is shown as instrumental in salvation: “For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God” (2:8).

In Hebrews, faith is described as “being sure of what we hope for and certain of what we do not see” (11:1). Faith thus is viewed as something that can be accomplished in the life of the believer—a calling of God not yet tangible or seen. To possess faith is to be loyal to God and to the gospel of Jesus Christ despite all obstacles. In the Letter of James, genuine works naturally accompany genuine faith. Works, however, are expressed in doing the will of God. The will of God means, for example, caring for the poor (James 2:15–16).

In 1 Peter, Christ is depicted as the broker of faith in God (1:21), whereas in 2 Peter and Jude faith is presented as received from God (2 Pet. 1:1). In the Letters of John “to believe” is used as a litmus test for those who possess eternal life: “You who believe in the name of the Son of God, . . . you have eternal life” (1 John 5:13).

Literally, fruit is the seed-bearing part of a plant. It constitutes an important part of the diet in the ancient Near East. Common fruits are olives, grapes, and figs, though many other varieties of fruit are also available, including apples, apricots, peaches, pomegranates, dates, and melons. Fruit trees play a prominent role as a food source in God’s creation and preparation of the garden of Eden (Gen. 1 3). The law prohibits the Israelites from cutting down their enemy’s fruit trees (Deut. 20:19). The abundance of fruit trees characterizes the land that God has prepared for Israel (Deut. 8:8; Neh. 9:25) as well as the final restoration (Ezek. 47:12; Joel 2:22; Rev. 22:2).

One aspect of fruit is that it grows from a plant. This use of the term is often extended to represent what emerges from something else. Thus, fruit may represent offspring, whether human or animal (Deut. 7:13; 28:4), one’s actions (Matt. 7:16–20), the result of one’s actions or choices (Prov. 1:31; 10:16; Jer. 17:10), or words coming from one’s mouth (Prov. 12:14; Heb. 13:15). In the NT especially, producing much fruit symbolizes performing deeds that are pleasing to God (Matt. 3:8; 13:23; Mark 4:20; John 15:16; Rom. 7:4; Col. 1:10). Those who live by the Spirit produce the fruit of the Spirit (Gal. 5:22–23). The apostle Paul speaks of the first converts in a particular region as being firstfruits, probably referring to their conversion as the result of the gospel being preached in the area (Rom. 16:5; 2 Thess. 2:13).

In the OT there is no language or understanding comparable to modern ways of talking about prayer as conversational or dialogical. Prayer does not involve mutuality. Prayer is something that humans offer to God, and the situation is never reversed; God does not pray to humans. Understanding this preserves the proper distinction between the sovereign God and the praying subject. Therefore, prayers in the OT are reverential. Some OT prayers have extended introductions, such as that found in Neh. 1:5, that seem to pile up names for God. These should be seen as instances not of stiltedness or ostentation, but rather as setting up a kind of “buffer zone” in recognition of the distance between the Creator and the creature. In the NT, compare the same phenomenon in Eph. 1:17.

A presupposition of prayer in the OT is that God hears prayer and may indeed answer and effect the change being requested. Prayer is not primarily about changing the psychological state or the heart of the one praying, but rather about God changing the circumstances of the one praying.

The depiction of prayer in the NT is largely consistent with that of the OT, but there are important developments.

Jesus tells his disciples to address God as “Father” (Matt. 6:9; cf. Rom. 8:15; Gal. 4:6). Prayer to God is now to be made in the name of Jesus (Matt. 18:19 20; John 14:13; 15:16; 16:23–26).

Prayer can also be made to Jesus (John 14:14), and such devotion to him in the early church is evidence of his being regarded as deity. Unlike anything prior in the OT, Jesus tells his followers to pray for their enemies (Matt. 5:44). Jesus and his followers serve as examples (Luke 23:34; Acts 7:60).

The Holy Spirit plays a vital role in prayers. It is by him that we are able to call out, “Abba, Father” (Rom. 8:15; Gal. 4:6). The Spirit himself intercedes for us (Rom. 8:26). Our praying is to be done in the Spirit (Eph. 6:18; Jude 20; possibly 1 Cor. 14:15).

Jesus encourages fervent and even continual or repeated prayer (Luke 18:1–8), but not showy or repetitive prayer (Matt. 6:5–8).

Jesus becomes the model of prayer. He prays before important decisions (Luke 6:12–13) and in connection with significant crisis points (Matt. 14:23; 26:36–44; Luke 3:21; 9:29; John 12:27). He offers prayers that are not answered (Luke 22:41–44) and prayers that are (Heb. 5:7). Even as he tells his disciples to always pray and not give up (Luke 18:1 [which is also the meaning of the sometimes overly literalized “pray without ceasing” in 1 Thess. 5:17 NRSV]), so he himself wrestles in prayer (Luke 22:41–44; Heb. 5:7). He has prayed for his disciples (John 17; Luke 22:32), and even now, in heaven, he still intercedes for us (Heb. 7:25). Indeed, our intercession before God’s throne is valid because his is (Heb. 4:14–16).