Bertrand Russell

"Mathematics, rightly viewed, possesses not only truth, but supreme beauty."

"Pure mathematics consists entirely of assertions to the effect that, if such and such a proposition is true of anything, then such and such another proposition is true of that thing."

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true."

"The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it."

"The fundamental concept in social science is Power, in the same sense in which Energy is the fundamental concept in physics."