Full Idea
It is a powerful argument for something's non-existence that it would make absolutely no difference.
Gist of Idea
A thing which makes no difference seems unlikely to exist
Source
Robin Le Poidevin (Travels in Four Dimensions [2003], 02 'Everything')
Book Reference
Le Poidevin,Robin: 'Travels in Four Dimensions' [OUP 2003], p.27
A Reaction
Powerful, but not conclusive. Neutrinos don't seem to do much, so it isn't far from there to get a particle which does nothing.
Related Idea
Idea 7022 To be is to have a capacity, to act on other things, or to receive actions [Plato]