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Full Idea
In aggregates one must necessarily arrive either at mathematical points from which some make up extension, or at atoms (which I dismiss), or else no reality can be found in bodies, or finally one must recognises substances that possess a true unity.
Gist of Idea
Aggregates don’t reduce to points, or atoms, or illusion, so must reduce to substance
Source
Gottfried Leibniz (Letters to Antoine Arnauld [1686], 1687.04.30), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 2
Book Ref
Garber,Daniel: 'Leibniz: Body, Substance, Monad' [OUP 2009], p.74
A Reaction
Garber calls this Leibniz's Aggregate Argument. Leibniz is, of course, talking of physical aggregates which have unity. He consistently points out that a pile of logs has no unity at all. But is substance just that-which-provides-unity?