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Full Idea
Two clocks in perfect agreement must be by natural influence, or the control of a craftsman, or their perfect construction at the beginning. Only the third way (of "preestablished harmony" by God) is possible.
Gist of Idea
Maybe mind and body are parallel, like two good clocks
Source
Gottfried Leibniz (The Nature and Communication of Substance [1690], p.121)
Book Ref
'The Philosophy of Mind', ed/tr. Beakley,B /Ludlow P [MIT 1992], p.121
A Reaction
Presumably 'natural influence' would cover the possibility that (unnoticed by you, apparently) one clock is attached to the other clock at the relevant points. If they are unconnected, presumably they are quite unaware of one another's existence.