G.III. 443 Definitions are not arbitrary, as Hobbes believed, and we cannot form ideas as we like, though it seems that the Cartesians are of this opinion. For it is necessary that these ideas which we undertake to form should be veritable, i.e., possible, and that the ingredients which we put into them should be compatible inter se.
Die philosophischen Schriƒten von. G.W. Leibniz, herausgegeben von C.J. Gerhardt. Berlin, 1875–90
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