"The aim of all life is to find pleasure and avoid pain."

"The greater the progress of science, the more it pushes back the limits of the unknown, but also the more it reveals the immensity of the unknown."

"No one who has tasted the forbidden fruit of knowledge can ever again be satisfied with the primitive bliss of ignorance."

"A man who has been the undisputed favorite of his mother retains throughout life the triumphant feeling, the confidence in success, which not seldom brings actual success with it."

"The complete sexual repression of the Victorian age led to an unprecedented increase in hysteria and other neurotic disorders."