Our knowledge can only be finite, while our ignorance must necessarily be infinite.

Our civilization...has not yet fully recovered from the shock of its birth - the transition from the tribal or 'closed society', with its submission to magical forces, to the 'open society' which sets free the critical powers of man.

Good tests kill flawed theories; we remain alive to guess again.

Science may be described as the art of systematic over-simplification.

Science must begin with myths, and with the criticism of myths.