This article considers complications for the principle in Descartes that effects are similar to their causes that are connected to his own denial that terms apply "univocally" to God and the creatures He produces. Descartes suggested that there remains an "analogical" relation in virtue of which our mind can be said to be similar to God's. However, this suggestion is undermined by the implication of his doctrine of the creation of the eternal truths that God's will differs entirely from our (...) own. The disappearance of analogy is even more evident in Spinoza and Regis. Both linked Descartes's doctrine to the principle that an effect differs from its cause with respect to what it receives from that cause, and both argued from that principle to the conclusion that we differ from God in both essence and existence. (shrink)