Depending upon who you ask today, the question "What is Truth" will get you very different answers and, perhaps, lead to even more questions. Here are some current thoughts on truth:
There is No Absolute Truth.
But wait a minute! This statement is making an absolute claim to truth. It defeats its own claim.
Truth is Relative.
Does that include the statement that truth is relative? It would have to, making this statement invalid since no claim to truth can be made by this statement, including the claim that truth is relative.
You have Your Truth and I have My Truth.
And if your truth and my truth are in conflict, what do we have? Can there be conflicting truths? If so, then how do you determine what is valid? If my truth is that there is no God, and your truth is that there is a God, does that really effect whether there is a God or not? Saying that we each have our own truth may make us comfortable but we would have to not care about truth to say this, because no matter what my experience or your experience tells us, the truth exists as it is.
Truth is within You.
Seek truth within yourself and you are back to what your experience tells you or to what you want to be the truth. Your perception may affect you and be true to what you want to believe, but it does not affect what the truth really is. Your experience and belief could be telling you that something false is true.
If you're tired of wondering or of playing these mind games, consider that maybe truth is not all that complex. Maybe it is something a child can grasp. Maybe truth is a person. The God-Man Jesus said, "I am the way, the truth, and the life. No one can come to the Father except through me." (John 14:6)
Will you be like Pilate, who asked "What is truth?" (John 18:38) right after Jesus said to him, "And I came to bring truth to the world. All who love the truth recognize that what I say is true," (John 18:37b)?
Or will you be like the Roman officer who saw Jesus die on the cross and said, "Truly, this was the Son of God!" (Mark 15:39)
As Jesus said, "I am the resurrection and the life; he who believes in Me shall live even if he dies, " (John 11:25) and "I am the door; if anyone enters through Me, he shall be saved; and shall go in and out, and find pasture," (John 10:9).