Full Idea
This shattering of oneself, this scorn of one's own nature, is actually a high degree of vanity. The whole morality of the Sermon on the Mount belongs here; in ascetic morality man prays to one part of himself as a god, and has to diabolify the rest.
Gist of Idea
The Sermon on the Mount is vanity - praying to one part of oneself, and demonising the rest
Source
Friedrich Nietzsche (Human, All Too Human [1878], 137)
Book Reference
Nietzsche,Friedrich: 'Human, All Too Human', ed/tr. Faber,Marion [Penguin 1994], p.95
A Reaction
This seems to be the core of Nietzsche's objection to Christian teaching - that it doesn't provide a direction of life for the whole human being. The modern rejection of religions agrees with Nietzsche, especially in disputes over the place of sex.