(1) A Corporeal Thing external to me;
(2) The Free-will of another in the performance of a particular act (praestatio);
(3) The State of another in relation to myself.
These correspond to the categories of Substance, Causality, and Reciprocity; and they form the practical relations between me and external objects, according to the Laws of Freedom.

— Immanuel Kant
https://palimpseste.vercel.app/#text/42e54c45-968b-451c-aeec-2ba0a674e1e9
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