“Opposition is true friendship”

“I've always felt that a person's intelligence is directly reflected by the number of conflicting points of view he can entertain simultaneously on the same topic.”

“There is no defense against criticism except obscurity”

“Our friends don't see our faults, or conceal them, or soften them”

“It is from the womb of art that criticism was born”

“The same vices that are gross and insupportable in others we do not notice in ourselves”