We could say that savages are not evil because they do not know what is good; for it is neither enlightenment nor legal restraint, but the calm of the passions and the ignorance of vice which prevents them from doing evil.
Gist of Idea
Savages avoid evil because they are calm, and never think of it (not because they know goodness)
Jean-Jacques Rousseau (Discourse on the Origin of Inequality , Part I)
Suggests one of my favourite ideas (Idea 519). While his hopes for savages and the state of nature may be optimistic, the idea that you won't do evil if it never crosses your mind (and it won't if you are a calm person) is very powerful.
Rousseau,Jean-Jacques: 'The Basic Political Writings', ed/tr. Cress,Donald A. [Hackett 1987], p.53
Idea 519 One must avoid even speaking of evil deeds [Democritus]