Jesus said…“If you continue in My word, you are truly My disciples, and you will know the truth, and the truth will make you free.” (Jn 8:31, 32)
Justin Martyr: “The word of truth is free, and carries its own authority, refusing to fall under any skillful argument or the scrutiny of its hearers. It is believed for its own nobility, and for the confidence due to Him who sends it. Now the word of truth is sent from God; therefore the freedom claimed by the truth is not arrogant. For being sent with authority, it is not fitting that authority be required to produce proof of what is said; since there is no proof beyond itself, which is God.
God, the Father of the universe, who is the perfect intelligence, is the truth. And the Word, being His Son, came to us, having put on flesh, revealing both Himself and the Father, giving to us in Himself resurrection from the dead, and eternal life afterwards. And this is Jesus Christ, our Saviour and Lord. He, therefore, is Himself both the faith and the proof of Himself and of all things. Therefore, those who follow Him, and know Him, having faith in Him as their proof, shall rest in Him. But since the adversary does not cease to resist many, and uses many and various arts to ensnare them, that he may seduce the faithful from their faith, and that he may prevent the faithless from believing, it seems to me necessary that we also, being armed with the invulnerable doctrines of the faith, do battle against him in behalf of the weak.” (Justin Martyr (100-165). Excerpts from Fragments of his lost work on the Resurrection)