A nail is driven out by another nail. Habit is overcome by habit.

A nail is driven out by another nail. Habit is overcome by habit.

The wise learn many things from their foes.

The wise learn many things from their foes.

We all have private ails. The troublemakers are they who need public cures for their private ails.

We all have private ails. The troublemakers are they who need public cures for their private ails.

Insanity -- a perfectly rational adjustment to an insane world.

Insanity -- a perfectly rational adjustment to an insane world.

He that will not apply new remedies must expect new evils; for time is the greatest innovator.

He that will not apply new remedies must expect new evils; for time is the greatest innovator.

To be fully alive is to feel that everything is possible.

To be fully alive is to feel that everything is possible.

The world's greatest thinkers have often been amateurs; for high thinking is the outcome of fine and independent living, and read more

The world's greatest thinkers have often been amateurs; for high thinking is the outcome of fine and independent living, and for that a professional chair offers no special opportunities.

Our species is the only creative species, and it has only one creative instrument, the individual mind and spirit of read more

Our species is the only creative species, and it has only one creative instrument, the individual mind and spirit of a man. Nothing was ever created by two men. There are no good collaborations, whether in music, in art, in poetry, in mathematics, in philosophy. Once the miracle of creation has taken place, the group can build and extend it, but the group never invents anything. The preciousness lies in the lonely mind of a man.

The burning of an author's books, imprisonment for opinion's sake, has always been the tribute that an ignorant age pays read more

The burning of an author's books, imprisonment for opinion's sake, has always been the tribute that an ignorant age pays to the genius of its time.