Treatise of Human Nature

"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 mind is a kind of theatre, where several perceptions successively make their appearance; pass, re-pass, glide away, and mingle in an infinite variety of postures and situations."

"When we run over libraries, persuaded of these principles, what havoc must we make? If we take in our hand any volume; of divinity or school metaphysics, for instance; let us ask, Does it contain any abstract reasoning concerning quantity or number? No. Does it contain any experimental reasoning concerning matter of fact and existence? No. Commit it then to the flames: for it can contain nothing but sophistry and illusion."

"In every system of morality, which I have hitherto met with, I have always remark'd, that the author proceeds for some time in the ordinary way of reasoning... when of a sudden I am surpriz'd to find, that instead of the usual copulations of propositions, *is* and *is not*, I meet with no proposition that is not connected with an *ought*, or an *ought not*."

"All kinds of reasoning consist in nothing but a comparison, and a discovery of such relations, either constant or inconstant, as the objects bear to each other."

"Belief is more properly an act of the sensitive, than of the cognitive part of our natures."

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