Courage is never to let your actions be influenced by your fears.

The principle that the end justifies the means is and remains the only rule of political ethics; anything else is just a vague chatter and melts away between one’s fingers.

A publisher who writes is like a cow in a milk bar.

The purposiveness of all vital processes, the strategy of the genes and the power of the exploratory drive in animal and man, all seem to indicate that the pull of the future is as real as the pressure of the past.

Einstein's space is no closer to reality than Van Gogh's sky.

Two half truths do not make a truth.

History knows no scruples and no hesitation. Inert and unnering flows towards her goal. History knows herway. She makes no mistakes.