Who said "The supreme art is to teach."?

This quote is attributed to Romain Rolland.

The supreme art is to teach. - Romain Rolland

"The supreme art is to teach."

Romain Rolland Education

Novelist Musician French 1866–1944

"Life is a beautiful struggle."

"Art is the effort of man to express the unspoken."

"Music is the one incorporeal entrance into the higher world of knowledge."

"Love is life's blood."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."