"The passions are the only causes of action, and reason is and ought only to be the slave of the passions."

"All our ideas are nothing but copies of our impressions, or, in other words, that it is impossible for us to think of anything, which we have not antecedently felt, either by our external or internal …"

"It is not contrary to reason to prefer the destruction of the whole world to the scratching of my finger."

"The most perfect philosophy of the natural kind is of little use to us, if it do not enable us to correct our errors, and regulate our passions."

"The greatest part of mankind are governed by authority, not by reason."