From Conversations With Goethe:

Goethe: "The highest a man can attain is wonder, and when the primordial phenomenon makes him wonder he should be content; it can give him nothing higher, and he should not look for anything beyond it; here is the boundary. But the sight of a primordial phenomenon is not generally enough for men; they think there must be more in back of it, like children who, having looked into a mirror, turn it around to see what is on the other side." From Conversations With Goethe by J.P. Eckermann; Translated by Gisela C. O'Brien; pg. 147.