Full Idea
The perfect agreement of so many substances which have no communication whatever with each other can only come from a common source.
Gist of Idea
If the universe is a perfect agreement of uncommunicating substances, there must be a common source
Source
Gottfried Leibniz (The Nature and Communication of Substance [1690], p.120)
Book Reference
'The Philosophy of Mind', ed/tr. Beakley,B /Ludlow P [MIT 1992], p.120