"The tendency to aggression is an innate, independent, instinctual disposition in man."

"The sexual instinct is the most powerful of all human drives."

"Civilization began the first time an angry man cast a stone instead of a word."

"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."

"Dreams are often most profound when they seem the most crazy."