Full Idea
It was only when aristocratic value judgements declined that the whole antithesis of "egoistic" and "unegoistic" obtruded itself more and more on the human conscience.
Clarification
"Egoism" is selfishness
Gist of Idea
Only the decline of aristocratic morality led to concerns about "egoism"
Source
Friedrich Nietzsche (On the Genealogy of Morals [1887], I.§02)
Book Reference
Nietzsche,Friedrich: 'On the Genealogy of Morals/ Ecce Homo', ed/tr. Kaufmann,Walter [Vintage 1969], p.26
A Reaction
But Aristotle, who is no aristocrat, has a balanced and sensible view of 'egoism', where it isn't the patronising arrogance that Nietzsche seems to like, but a proper concern with one's own character.