wisdom through experience

Not to wish to see too soon.— As long as one lives through the experience, one must surrender to the experience and shut one's eyes instead of becoming an observer immediately. For that would disturb the good digestion of the experience: instead of wisdom one would acquire indigestion.

From the practice of wise men.— To become wise, one must wish to have certain experiences and run, as it were, into their gaping jaws. This, of course, is very dangerous; many a wise guy has been swallowed.

from Nietzsche's The Wanderer and His Shadow §297-298