"Ignorance leads to fear, fear leads to hatred, and hatred leads to violence. This is the equation."

"The purpose of rhetoric is to persuade, the purpose of logic is to prove, and the purpose of philosophy is to know."

"The study of philosophy is obligatory, even if it leads to conclusions contrary to those of the theologians."

"The world is divided into men who have wit and no religion and men who have religion and no wit."

"The truth does not contradict the truth; rather, it is consistent with it and bears witness to it."