"The unconscious is the true psychic reality."

"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."

"The first requisite of civilization is that we should learn to distinguish between the good and the bad."

"The aim of all life is to return to the inorganic state."

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