What is one “truth” that is not a) contextual, or b) discovered/conditioned through experience inside a particular culture?

For those of you that give an unconditioned, unexperienced, and uncontextual truth, how did you come to know/realize/prove the truth outside of your cultural understanding?

Conversely, does the mere fact of a truth being conditioned, contextual, or experienced negate the truth; if so, how?