No rational argument will have a rational effect on a man who does not want to adopt a rational attitude.
Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.
While differing widely in the various little bits we know, in our infinite ignorance we are all equal.
No book can ever be finished. While working on it we learn just enough to find it immature the moment we turn away from it
Science may be described as the art of systematic oversimplification.
It is complete nihilism to propose laying down arms in a world where atom bombs are around. It is very simple: there is no way of achieving peace other than with weapons.
What we need and what we want is to moralize politics, not to politicize morals.
Always remember that it is impossible to speak in such a way that you cannot be misunderstood: there will always be some who misunderstand you.
We can all participate in the heritage of man. We all can help to preserve it. And we can all make our own modest contribution to it.We must not as for more.
We are social creatures to the inmost centre of our being. The notion that one can begin anything at all from scratch, free from the past, or unindebted to others, could not conceivably be more wrong.