where is man's truth to be found?

All of us have had the experience of a sudden joy that came when nothing in the world had forewarned us of its coming—a joy so thrilling that if it was born of misery we remembered even the misery with tenderness. All of us, on seeing old friends again, have remembered with happiness the trials we lived through with those friends. Of what can we be certain except this—that we are fertilized by mysterious circumstances? Where is man's truth to be found?

— Antoine de Saint-Exupery