"The identity that we ascribe to things is only a fictitious one, established by the mind, not a peculiar nature belonging to what we're talking about."

"There are no such things as moral demonstrations."

"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 may be divided into two classes; that of shallow thinkers, who fall short of the truth, and that of abstruse thinkers, who go beyond it."

"Beauty in things exists in the mind which contemplates them."