Full Idea
The force or proximate cause of these changes [of position] is something more real, and there is sufficient basis to attribute it to one body more than to another.
Clarification
A 'proximate' cause is the one closest to the effect
Gist of Idea
The immediate cause of movements is more real [than geometry]
Source
Gottfried Leibniz (Discourse on Metaphysics [1686], §18), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 3
Book Reference
Garber,Daniel: 'Leibniz: Body, Substance, Monad' [OUP 2009], p.119
A Reaction
The force is said to be 'more real' than geometry. Leibniz seems to have embraced fairly physical powers in the period 1678-1698, and then seen them as more and more like spirits.