Full Idea
Nietzsche was fascinated by the idea of a will that turns against itself, against its usual impulses.
Gist of Idea
Nietzsche was fascinated by a will that can turn against itself
Source
report of Friedrich Nietzsche (Works (refs to 8 vol Colli and Montinari) [1885]) by Rüdiger Safranski - Nietzsche: a philosophical biography 03
Book Reference
Safranski,Rüdiger: 'Nietzsche: a philosophical biography' [Granta 2003], p.49
A Reaction
This strikes me as very existentialist - a case of existence before essence.