29. Of our desires some are natural and necessary; others are natural, but not necessary; others, again, are neither natural nor necessary, but are due to illusory opinion. [Epicurus regards as natural and necessary desires which bring relief from pain, as e.g. drink when we are thirsty; while by natural and not necessary he means those which merely diversify the pleasure without removing the pain, as e.g. costly viands; by the neither natural nor necessary he means desires for crowns and the erection of statues in one’s honour.—Schol.]

30. Those natural desires which entail no pain when not gratified, though their objects are vehemently pursued, are also due to illusory opinion; and when they are not got rid of, it is not because of their own nature, but because of the man’s illusory opinion.

31. Natural justice is a symbol or expression of expediency, to prevent one man from harming or being harmed by another.

32. Those animals which are incapable of making covenants with one another, to the end that they may neither inflict nor suffer harm, are without either justice or injustice. And those tribes which either could not or would not form mutual covenants to the same end are in like case.

33. There never was an absolute justice, but only an agreement made in reciprocal intercourse in whatever localities now and again from time to time, providing against the infliction or suffering of harm.