Thomas saith unto him, Lord, we know not whither thou goest; how know we the way?
Jesus saith unto him, I am the way, and the truth/alētheia, and the life: no one cometh unto the Father, but by me. John 14:5-6
Jesus, is God the Son. Grace and truth came through Jesus Christ.
1In the beginning was the Word, and the Word was with God, and the Word was God. 2The same was in the beginning with God. 3All things were made through him; and without him was not anything made that hath been made. 4In him was life; and the life was the light of men. 5And the light shineth in the darkness; and the darkness apprehended it not. …
14And the Word became flesh, and dwelt among us (and we beheld his glory, glory as of the only begotten from the Father), full of grace and truth. 15John beareth witness of him, and crieth, saying, This was he of whom I said, He that cometh after me is become before me: for he was before me. 16For of his fulness we all received, and grace for grace. 17For the law was given through Moses; grace and truth came through Jesus Christ. 18No man hath seen God at any time; the only begotten Son, who is in the bosom of the Father, he hath declared him. John 1:1-4; John 1:14-18
Jesus is the only truth. The Law was Old Covenant truth Psalm 119:142. Jesus came to fulfill the Law.
17Think not that I came to destroy the law or the prophets: I came not to destroy, but to fulfil. 18For verily I say unto you, Till heaven and earth pass away, one jot or one tittle shall in no wise pass away from the law, till all things be accomplished. 19Whosoever therefore shall break one of these least commandments, and shall teach men so, shall be called least in the kingdom of heaven: but whosoever shall do and teach them, he shall be called great in the kingdom of heaven.
20For I say unto you, that except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no wise enter into the kingdom of heaven. Matthew 5:17–20
Jesus came into the world to bear witness to the truth.
37Pilate therefore said unto him, Art thou a king then? Jesus answered, Thou sayest that I am a king. To this end have I been born, and to this end am I come into the world, that I should bear witness unto the truth. Every one that is of the truth heareth my voice. John 18:37
The truth is in Jesus.
17This I say therefore, and testify in the Lord, that ye no longer walk as the Gentiles [pagans] also walk, in the vanity of their mind, 18being darkened in their understanding, alienated from the life of God, because of the ignorance that is in them, because of the hardening of their heart; 19who being past feeling gave themselves up to lasciviousness, to work all uncleanness with greediness. 20But ye did not so learn Christ; 21if so be that ye heard him, and were taught in him, even as truth is in Jesus: 22that ye put away, as concerning your former manner of life, the old man, that waxeth corrupt after the lusts of deceit; 23and that ye be renewed in the spirit of your mind, 24and put on the new man, that after God hath been created in righteousness and holiness of truth. Ephesians 4:17-24
That Scripture shows pagans walk in the vanity of their minds. Their values and worldviews accommodate lasciviousness, to work all uncleanness with greediness. Truth is in Jesus. His kingdomview leads us to be renewed in the spirit of our mind, “and put on the new man, that after God hath been created in righteousness and holiness of truth.”
All Scripture quoted is from the ASV