It is a very high goal which, with our weak powers, we can reach only >>
We cannot despair of humanity, since we ourselves are human beings. >>
Education is the progressive realization of our ignorance. >>
Good tests kill flawed theories; we remain alive to guess again. >>
Theories that go counter to the facts of human nature are foredoomed. >>
Some theories are good for nothing except to be argued about. >>
A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.