Who said "Self-made men are rarely entirely self-made."?

This quote is attributed to Otto Kahn.

Self-made men are rarely entirely self-made. - Otto Kahn

"Self-made men are rarely entirely self-made."

Otto Kahn

Banker & Patron German-American 1867–1934

"A man's wealth is not in the money he has, but in the money he can afford to lose."

"The greatest luxury is to have time."

"Art is the effort of man to express, not to expose, his inner self."

"Culture is not just an ornament of life, it is the very essence of a full life."