Full Idea
Nietzsche believed, in effect, that as the facts of human psychology really were, there could be no such thing as human virtues, dispositions good in any man.
Gist of Idea
Nietzsche thought our psychology means there can't be universal human virtues
Source
report of Friedrich Nietzsche (Works (refs to 8 vol Colli and Montinari) [1885]) by Philippa Foot - Nietzsche's Immoralism p.157
Book Reference
Foot,Philippa: 'Moral Dilemmas' [OUP 2002], p.157
A Reaction
Presumably each individual can only have virtues appropriate to their individual nature, which is something like channelling their personal psychological drives. Can't we each have our individual version of courage or honesty?