Respectability offends my taste.

Only you must have worthy foes hate, but not enemies worthy of contempt. You must be proud of your enemy.

Fathers have a lot to do to make up for having sons.

The disappointed one speaks. I searched for great human beings; I always found only the apes of their ideals.

Every fact and every work exercises a fresh persuasion over every age and every new species of man. History always enunciates new truths.

God is a gross answer, an indelicacy against us thinkers- at bottom merely a gross prohibition for us: you shall not think!

The most general deficiency in our sort of culture and education is gradually dawning on me: no one learns, no one strives towards, no one teaches--enduring loneliness.