Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god.

It is sometimes important for science to know how to forget the things she is surest of.

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

There are moments when very little truth would be enough to shape opinion. One might be hated at extremely low cost.

There are certain moments when we might wish the future were built by men of the past.

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.

Being right is less important to us than the freedom to be wrong.