What is meant by God is truth?

By truth is meant the perfect conformity of God’s being, attributes, words, and activities to all that God is, ought to be, and claims to be.

Three Aspects:

      (1)  Metaphysically, God is the only true or genuine God in the face of all pretenders. No other claimant is what he must be in order to claim to be God. God alone answers to the authentic idea of God.

            Deuteronomy 6:4—The Lord our God the Lord is One.

            Jeremiah 10:10 (cf. vv. 1–9)—Yahweh is the true God.

            John 17:3—This is eternal life: that they may know you, the only true God.

      (2)  Epistemologically, God is the truthful God: The knowledge, declarations, and representations of God eternally conform to his being. He always represents things as they actually are and his prophetic decrees are always accurate.

John 17:17—Your word is truth.

Titus 1:2—God cannot lie.

(3)  Ontologically, God embodies truth as to its foundational source and basis.

John 14:6—I am the truth.

Colossians 2:3—In him are hidden all the treasures of wisdom and knowledge.

Proverbs 1:7—The fear of the Lord is the beginning of knowledge.

Truth, by definition, is that which conforms to God; that which God would say about a thing. There is no reality external to God by which truth may be evaluated and validated. God is the standard of all truth.