Full Idea
The preachers of virtue are its worst enemies. For they teach virtue as an ideal for everyone; they take from virtue the charm of the rare, the inimitable, the exceptional and unaverage - its aristocratic magic.
Gist of Idea
Virtue for everyone removes its charm of being exceptional and aristocratic
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 10[109])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.193
A Reaction
At last I think I have found why Nietzsche disliked Aristotle, who makes elementary 'phronesis' (practical reason) a sufficient intellectual endowment to achieve virtue, with no need of more than moderate wealth or power. I prefer Aristotle.