David Hume — "The most perfect happiness consists in the most perfect activity."

"The error is not in the senses, but in the understanding."

"It forms a strong presumption against all supernatural and miraculous relations, that they are observed chiefly to abound among ignorant and barbarous nations; or if a civilized people has ever given …"

"It is impossible for us to think of any thing, which we have not antecedently felt, either by our external or internal senses."

"There is nothing in itself valuable or despicable, desirable or hateful, but as it acquires these attributes from the mind of the person who surveys it."

"The general maxims of morality are insufficient to determine us to action."