Full Idea
Any machine ...is best defined in terms of its final cause, so that in the description of the parts it is therefore apparent in what way each of them is coordinated with the others for the intended us.
Gist of Idea
A machine is best defined by its final cause, which explains the roles of the parts
Source
Gottfried Leibniz (The Human Body is a sort of Machine [1683], p.290), quoted by Richard T.W. Arthur - Leibniz 3 'Machines'
Book Reference
Arthur, Richard T.W.: 'Leibniz' [Polity 2014], p.71
A Reaction
We would use the 'function', an inherently teleological concept, and a concept which is almost indispensable for giving an illuminating description of the world. If nature is dispositional, it points towards things. Leibniz views persons as machines.