Have the courage to take your own thoughts seriously, for they will shape you.

All of us who are concerned for peace and triumph of reason and justice must be keenly aware how small an influence reason and honest good will exert upon events in the political field.

It is my conviction that killing under the cloak of war is nothing but an act of murder.

I never thought that others would take my theories so much more seriously than I did.

Persistence is the most powerful force on earth, it can move mountains.

The creative scientist studies nature with the rapt gaze of the lover, and is guided as often by aesthetics as by rational considerations in guessing how nature works.

Put your hand on a hot stove for a minute and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute.