We don't touch something hot, because we believe it is true that it will burn us. Our conduct is regulated by what we perceive to be truth. We can misconstrue what we observe. This opens the door to preconception and prejudices being given more authority than they deserve. The more truth we know, the less mistakes we will experience and the better will be our quality of life.
Truth can bear scrutiny because it has sound evidence to support it.
Whether or not we perceive or accept it, truth stands on its own merits regardless of who states it, or who questions it. It cannot be hurt by examination, accusations, or questions. It is not affected by the process of discovery, nor by the personality of the one who discovers it. Truth is eternally sure, and belief or disbelief, acceptance or rejection, does not destroy, harm or change it. We only hurt ourselves if we ignore truth and prefer to believe a lie.