God reveals himself truthfully in Scriptures

John 1:1-4 In the beginning was the Word, and the Word was with God, and the Word was God.

2 The same was in the beginning with God.

3 All things were made by him; and without him was not any thing made that was made.

4 In him was life; and the life was the light of men.

John 17:3 And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.

John 17:17  Sanctify them through thy truth: thy word is truth.

Hebrews 4:12  For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.

1 Peter 1:23  Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.

Ephesians 5:26  That he might sanctify and cleanse it with the washing of water by the word,