"What is common in all these situations is the use of the unconscious as a means of communication."

"The tendency to aggression is an innate, independent, instinctual disposition in man... it constitutes the most powerful obstacle to culture."

"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."

"Sometimes a cigar is just a cigar."

"The dream is the liberation of the spirit from the pressure of external nature, a detachment of the soul from the fetters of matter."