Wilhelm Von Humboldt said this quote

Faith can be interested in results only, for a truth once recognized as such puts an end to the believer's thinking.

~ Wilhelm Von Humboldt

All situations in which the interrelationships between extremes are involved are the most interesting and instructive.

~ Wilhelm Von Humboldt

To judge a man means nothing other than to ask: What content does he give to the form of humanity? What concept should we have of humanity if he were its only representative?

~ Wilhelm Von Humboldt

All growth toward perfection is but a returning to original existence.

~ Wilhelm Von Humboldt