Theories pass. The frog remains.

Far too often the choices reality proposes are such as to take away one's taste for choosing.

We are not naïve enough to ask for pure men; we ask merely for men whose impurity does not conflict with the obligations of their job.

I don't judge a regime by the damning criticism of the opposition, but by the ingenuous praise of the partisan.

Renown? I've already got more of it than those I respect, and will never have as much as those for whom I feel contempt.

Think? Why think! We have computers to do that for us.

It is not easy to imagine how little interested a scientist usually is in the work of any other, with the possible exception of the teacher who backs him or the student who honors him.