Full Idea
There is no possible reason which could limit the quantity of matter; therefore there cannot in fact be any such limitation.
Gist of Idea
No reason could limit the quantity of matter, so there is no limit
Source
Gottfried Leibniz (Letters to Samuel Clarke [1716], 4.21)
Book Reference
Leibniz,Gottfried: 'Philosophical Writings', ed/tr. Parkinson,G.H.R. [Dent 1973], p.218