Uncertainty in the pressure of vivid hopes and fears is painful, but must be endured if we wish to live without the support of comforting fairy tales.

What science cannot discover, mankind cannot know.

The degree of one's emotions varies inversely with one's knowledge of the facts - the less you know the hotter you get.

Reason is a harmonising, controlling force rather than a creative one.

Life is just one cup of coffee after another, and don't look for anything else.

I do not pretend to start with precise questions. I do not think you can start with anything precise. You have to achieve such precision as you can, as you go along.

You must believe that you can help bring about a better world. A good society is produced only by good individuals, just as truly as a majority in a presidential election is produced by the votes of single electors.