I know that philosophically a murderer is not responsible for his crime, but I prefer not to take tea with him.

In the midst of every crisis, lies great opportunity.

Science is the century-old endeavor to bring together by means of systematic thought the perceptible phenomena of this world into as thorough-going an association as possible.

The world is in greater peril from those who tolerate or encourage evil than from those who actually commit it.

Insanity: doing the same thing over and over again and expecting different results.

I do not believe in a personal God and I have never denied this but have expressed it clearly.

When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again.