It is possible that the production of genius is reserved to a limited period of mankind's history.

We do not belong to those who only get their thought from books, or at the prompting of books, -- it is our custom to think in the open air, walking, leaping, climbing, or dancing on lonesome mountains by preference, or close to the sea, where even the paths become thoughtful.

Speaking generally, punishment hardens and numbs, it produces concentration, it sharpens the consciousness of alienation, it strengthens the power of resistance.

Once the decision has been made, close your ear even to the best counter argument: sign of a strong character. Thus an occasional will to stupidity.

Man alone resists the direction of gravitation: he constantly wants to fall--upwards.

The surest sign of the estrangement of the opinions of two persons is when they both say something ironical to each other and neither of them feels the irony.

Is not wounded vanity the mother of all tragedies?