Thanks, Dan!
That's a tough question. As Pilate asked, "What is truth?" It appears that Jesus did not know the answer. Truth is tricky, and some people doubt there is any absolute truth. I believe there is truth, and I'd define it as an accurate assessment of reality. I do not considering magically parting seas, people surviving being swallowed by fish for three days, walking on water, and rising from the grave to be part of reality. As far as I can tell, such events are impossible.
As for a "source" of truth, I don't believe there is any one source. My five senses are good tools to know truth, and the word of other people can sometimes be a source of truth.I hope I answered your question.
Isa 53:7 He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth.
Mat 27:11 And Jesus stood before the governor: and the governor asked him, saying, Art thou the King of the Jews? And Jesus said unto him, Thou sayest.
Mat 27:12 And when he was accused of the chief priests and elders, he answered nothing.
Mat 27:13 Then said Pilate unto him, Hearest thou not how many things they witness against thee?
Mat 27:14 And he answered him to never a word; insomuch that the governor marvelled greatly.
Joh 18:37 Pilate therefore said unto him, Art thou a king then? Jesus answered, Thou sayest that I am a king. To this end was I born, and for this cause came I into the world, that I should bear witness unto the truth. Every one that is of the truth heareth my voice.
Joh 17:17 Sanctify them through thy truth: thy word is truth.
Joh 8:31 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed;
Joh 8:32 And ye shall know the truth, and the truth shall make you free.
Joh 7:32 The Pharisees heard that the people murmured such things concerning him; and the Pharisees and the chief priests sent officers to take him.
Joh 7:45 Then came the officers to the chief priests and Pharisees; and they said unto them, Why have ye not brought him?
Joh 7:46 The officers answered, Never man spake like this man.
Jesus knew truth,and proclaimed truth,but He knew when to speak and when to be quiet and not say a word.