Mathematicians, like cows in the dark, all look alike to me.
Science, in the very act of solving problems, creates more of them.
You have had your last bad meal. But, you have also heard your last honest compliment, and you have lost your last true friend.
The real enemy is the man who tries to mold the human spirit so that it will not dare to spread its wings.
The world in which we live is the only world about which our senses can testify.
We must not overlook the role that extremists play. They are the gadflies that keep society from being too complacent or self-satisfied; they are, if sound, the spearhead of progress. If they are fundamentally wrong, free discussion will in time put an end to them.