Full Idea
Given any event, and the assumption that every event has a cause, then some power can always be invented as the cause of that event.
Gist of Idea
If every event has a cause, it is easy to invent a power to explain each case
Source
Stephen Mumford (Dispositions [1998], 06.6)
Book Reference
Mumford,Stephen: 'Dispositions' [OUP 1998], p.137
A Reaction
This is a useful warning, and probably explains why 'powers' fell out of fashion in scientifice theorising. They seem to make a return, though, as an appropriate term for the bottom level of each of our explanations.