Full Idea
The best explanation explains the most by means of the least. Explanation unifies.
Gist of Idea
Best explanations explain the most by means of the least
Source
David M. Armstrong (What is a Law of Nature? [1983], 05.4)
Book Reference
Armstrong,D.M.: 'What is a Law of Nature?' [CUP 1985], p.73
A Reaction
To get unification, you need to cite the diversity of what is explained, and not the mere quantity. The force of gravity unifies because it applies to such a diversity of things.