Full Idea
My main proposition: there are no moral phenomena, there is only a moral interpretation of those phenomena. This interpretation itself is of extra-moral origin.
Gist of Idea
Morality is merely interpretations, which are extra-moral in origin
Source
Friedrich Nietzsche (Writings from Late Notebooks [1887], 02[165])
Book Reference
Nietzsche,Friedrich: 'Writings from the Late Notebooks', ed/tr. Bittner,Rüdiger [CUP 2003], p.94
A Reaction
The origin will, of course, be the 'will to power', which is the drive for survival, linking Nietzsche with sociobiology or evolutionary psychology.