Parenthood is not an object of appetite or even desire. It is an object of will. There is no appetite for parenthood; there is only a purpose or intention of parenthood.

The history of thought, and therefore all history, is the re-enactment of past thought in the historian's own mind.

Nothing capable of being memorized is history.

A man ceases to be a beginner in any given science and becomes a master in that science when he has learned that... he is going to be a beginner all his life.

Perfect Freedom is reserved for the man who lives by his own work, and in that work does what he wants to do.

What a man is ashamed of is always at bottom himself; and he is ashamed of himself at bottom always for being afraid.

The chief business of seventeenth-century philosophy was to reckon with seventeenth-century science... the chief business of twentieth-century philosophy is to reckon with twentieth-century history.