"I am sensible, that, in order to make a man a good cavaller, 'tis not sufficient to teach him to ride; he must have a good horse."

"The great subverter of the universe, and of all systems of theology and moral philosophy, is the principle of ANARCHY."

"Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them."

"The chief spring or actuating principle of the human mind is pleasure or pain."

"To be a philosophical sceptic is, in a man of letters, the first and most essential step towards being a true philosopher."