Full Idea
All friendly feelings for others are extensions of a man's feelings for himself.
Gist of Idea
All altruism is an extension of self-love
Source
Aristotle (Nicomachean Ethics [c.334 BCE], 1168b06)
Book Reference
Aristotle: 'Ethics (Nicomachean)', ed/tr. ThomsonJ A K/TredennickH [Penguin 1976], p.300
A Reaction
I'm not sure what his evidence is for this. The love of parents for their children doesn't seem to be based on self-love.