Full Idea
Nietzsche believed that moral generalisation was impossible because the proper subject of evaluation was, instead, a person's individual act.
Gist of Idea
Moral generalisation is wrong, because we should evaluate individual acts
Source
report of Friedrich Nietzsche (Works (refs to 8 vol Colli and Montinari) [1885]) by Philippa Foot - Nietzsche's Immoralism p.155
Book Reference
Foot,Philippa: 'Moral Dilemmas' [OUP 2002], p.155
A Reaction
This suggests a different type of particularism, focusing on the particular decision, rather than on the details of the situation. Presumable no two moral decisions are ever sufficiently the same to be compared. But a lie is a lie.