Scriptures show, the “truth” to which Jesus bore witness was not just truth in general. It was the all-important truth of what God’s purposes were and are, truth based on the fundamental fact of God’s sovereign will and His ability to fulfill that will. (See John 18:37) By his ministry Jesus revealed that truth, contained in “the sacred secret,” as being God’s Kingdom with Jesus Christ, the “son of David,” serving as King-Priest on the throne. This was also the essence of the message proclaimed by angels prior to and at the time of his birth in Bethlehem of Judea, the city of David.-Luke 1:32, 33; 2:10-14; 3:31.
The accomplishment of his ministry in bearing witness to the truth required more of Jesus than merely talking, preaching, and teaching. Besides shedding his heavenly glory to be born as a human, he had to fulfill all the things prophesied about him, including the shadows, or patterns, contained in the Law covenant. (Col 2:16, 17; Heb 10:1) To uphold the truth of his Father’s prophetic word and promises Jesus had to live in such a way as to make that truth become reality, fulfilling it by what he said and did, how he lived, and how he died. Thus, he had to be the truth, in effect, the embodiment of the truth, as he himself said he was.-John 14:6.
For this reason the apostle John could write that Jesus was “full of undeserved kindness and truth” and that, though “the Law was given through Moses, the undeserved kindness and the truth came to be through Jesus Christ.” (John 1:14, 17) By means of his human birth, his presenting himself to God by baptism in water, his three and a half years of public service in behalf of God’s Kingdom, his death in faithfulness to God, his resurrection to heaven-by all these historical events-God’s truth arrived, or “came to be,” that is, came to realization. (Compare John 1:18; Colossians 2:17.) The whole career of Jesus Christ was therefore a “bearing witness to the truth,” to the things to which God had sworn. Jesus was thus no shadow Messiah or Christ. He was the real one promised. He was no shadow King-Priest. He was, in substance and fact, the true one that had been prefigured.-Romans 15:8-12; compare Psalms 18:49; 117:1; Deuteronomy 32:43; Isaiah 11:10.
This truth was the truth that would “set men free” if they showed themselves to be “on the side of the truth” by accepting Jesus’ role in God’s purpose. (John 8:32-36; 18:37) To ignore God’s purpose concerning his Son, to build hopes on any other foundation, to form conclusions regarding one’s life course on any other basis would be to believe a lie, to be deceived, to follow the leading of the father of lies, God’s Adversary. (Matthew 7:24-27; John 8:42-47) It would mean “to die in one’s sins.” (John 8:23, 24) For this reason Jesus did not hold back from declaring his place in God’s purpose.