Finding Answers History! Religion! Science!

A mysterious and tremendous thing comes to reveal itself in the course of the lifetime of an earthly human. So mysteriously confronted by it, the earthly human becomes awed by this compelling human attribute. The earthly human becomes so enraptured by it that he begins to consider it as a quality that defines and explains his human nature. The earthly human desires to know; the earthly human desires to understand that which his physical body sense experiences of earthly reality. The earthly human holds so much psychological and intellectual desire toward knowing it that he gives it a name truth.

How does the earthly human discover truth?