Full Idea
The only form of causality of which we are aware is that between willing and acting - we transfer this to all things, and thereby explain the relationship between two changes that always occur together.
Gist of Idea
We experience causation between willing and acting, and thereby explain conjunctions of changes
Source
Friedrich Nietzsche (Unpublished Notebooks 1872-74 [1873], 19 [209])
Book Reference
Nietzsche,Friedrich: 'Unpublished of 'Unfashionable Obs' period (v 11)', ed/tr. Gray,Richard T. [Stanford 1995], p.64
A Reaction
This is a rather Humean view, of projecting our experience onto the world, but it may be that we really are experiencing real causation, just as it occurs between insentiate things.