Full Idea
There is only one evil - egoism; there is only one good - love. ...Love, but truly! All other virtues will automatically come to you.
Gist of Idea
Egoism is the only evil, love the only good; genuine love produces all the other virtues
Source
Ludwig Feuerbach (Fragments on My Philosophical Development [1839], 1834-6)
Book Reference
Feuerbach,Ludwig: 'The Fiery Brook: Selected Writings', ed/tr. Hanfi,Zawar [Anchor 1972], p.278
A Reaction
This is a rather Christian idea of virtue, coming from the great atheist. Does tough love come from love?