Thus, while _reason_ conveys the knowledge of truth and falsehood, _sentiment_ or emotion must give beauty and deformity, vice and virtue.
Appendix No.II.is a discussion of SELF-LOVE.

The author adverts first to the position that benevolence is a mere pretence, a cheat, a gloss of self-love, and dismisses it with a burst of indignation.

He next considers the less offensive view, that all benevolence and generosity are resolvable in the last resort into self-love.

He does not attribute to the holders of this opinion any laxity in their own practice of virtue, as compared with other men.

Epicurus and his followers were no strangers to probity; Atticus and Horace were men of generous dispositions; Hobbes and Locke were irreproachable in their lives.
These men all allowed that friendship exists without hypocrisy; but considered that, by a sort of mental chemistry, it might be made out self-love, twisted and moulded by a particular turn of the imagination.
But, says Hume, as some men have not the turn of imagination, and others have, this alone is quite enough to make the widest difference of human characters, and to stamp one man as virtuous and humane, and another vicious and meanly interested.