There are various meanings of the word ‘truth’ in the Bible, some of which are similar to those we use today. A person or thing may be true, meaning the opposite of false (Deut 13:14; Prov 12:19; Rom 9:1; see LIE) or the opposite of insincere (Gen 42:16; Phil 1:18; 1 John 3:18; see HYPOCRISY). A thing may be called true in contrast to that which is only a shadow or picture (John 1:9; 15:1; Heb 9:24; see TYPE). The Bible often uses ‘true’ with the meaning of reliable, faithful or trustworthy (Gen 24:49; 47:29; Ps 57:10; Rev 22:6).
God is truth
All these meanings are in some way applied to God (Ps 19:9; Jer 10:9-10; 42:5; Micah 6:20; Rom 3:4; 1 Thess 1:9; Rev 16:7). Truth is God’s very nature. He is the basic reality from which everything else springs (John 1:3-4,14; 8:26; Rom 1:25). God became human in Jesus, and therefore Jesus is truth in human form (John 14:6; Eph 4:21; Rev 3:7).
As the Old Testament spoke of the God of truth or, to use the related word, the God of the Amen (Isa 65:16), so the New Testament speaks of Jesus as the Amen. He is the one in whom God’s truth is perfectly expressed, and through whom God’s promises are perfectly fulfilled (John 1:17; 2 Cor 1:20; Rev 3:14; see AMEN). Jesus spoke repeatedly about the truth, and those who come to know him come to know the truth. Thereby they are freed from the bondage of sin, brought into a living relationship with the true God, and indwelt by him who is the Spirit of truth (John 8:32; 14:17; 16:13; 17:3; 2 John 1-2). Truth, in the sense spoken of by Jesus, saves people, for it represents the full saving activity of God through Jesus Christ. Jesus’ life and teaching were directed towards revealing and fulfilling God’s truth (John 1:17; 8:32,45-46; 17:17,19; 18:37). A natural development from this was to speak of ‘truth’ as referring to the whole body of Christian teaching (2 Cor 4:2; Gal 2:5; 5:7; Eph 1:13; 1 Tim 2:4; 2 Tim 2:15). This is in keeping with the Old Testament usage of ‘truth’ as applying to the revealed Word of God (Ps 25:5; 86:11; 119:142; see REVELATION).
Christian character
Truth in all its aspects should characterize the lives of those who have come under the rule of him who is the truth (Exod 18:21; Ps 26:3; John 3:21; 2 Cor 13:8; Eph 4:15,25; 6:14; Titus 1:2; Heb 6:18; 3 John 4). Having become obedient to the truth, they must be loyal to the truth, without any trace of falsehood, insincerity or unfaithfulness (1 Cor 5:8; 2 Cor 4:2; Gal 4:16; 1 Peter 1:22). Their possession of God’s truth, however, is no reason for Christians to claim absolute authority for their own theories or opinions. The human mind is limited and, like all human capacities and abilities, is affected by sin (1 Cor 8:2). God alone is the possessor of absolute truth (Isa 55:8-9; Rom 11:33-34; see KNOWLEDGE).