"The ego is not master in its own house."

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

"Men are more moral than they think and far more immoral than they can imagine."

"Religion is an illusion and it derives its strength from the fact that it falls in with our instinctual desires."

"The more the fruits of knowledge become accessible to men, the more widespread is the decline of religious belief."