“Everyone knows what a curve is, until he has studied enough mathematic...” — Felix Klein Quote

“Everyone knows what a curve is, until he has studied enough mathematics to become confused through the countless number of possible exceptions.”

“The developing science departs at the same time more and more from its original scope and purpose and threatens to sacrifice its earlier unity and split into diverse branches.”

“Thus, in a sense, mathematics has been most advanced by those who distinguished themselves by intuition rather than by rigorous proofs.”

“I'm not confused about what's happening in fashion, because I follow my own direction and go.”

“The fact - not theory - that evolution has occurred and the Darwinian theory as to how it occurred have become so confused in popular opinion that the distinction must be stressed.”

“You have to realize that people are always going to be confused or sometimes threatened by someone who has the confidence to do something different.”