I have come to know the mutability of all human relationships and have learned to insulate myself against both heat and cold so that a temperature balance is fairly well assured.

The only justification for our concepts and systems of concepts is that they serve to represent the complex of our experiences; beyond this they have not legitimacy.

Man would indeeded be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.

One can't teach a cat not to catch birds

Earth is the insane asylum of the universe.

A finely tempered nature longs to escape from the personal life into the world of objective perception and thought.

... the desire for truth must take precedence over all other desires.