Full Idea
Perhaps the most important of all multi-valued properties is energy itself. I think a scientific realist must believe that energy exists.
Gist of Idea
Energy is the key multi-valued property, vital to scientific realism
Source
Brian Ellis (The Metaphysics of Scientific Realism [2009], 2)
Book Reference
Ellis,Brian: 'The Metaphysics of Scientific Realism' [Acument 2009], p.45
A Reaction
It's odd that the existence of the most basic thing in physics needs a credo from a certain sort of believer. I have been bothered by notion of 'energy' for fifty years, and am still none the wiser. I'm sure I could be scientific realist without it.