E3P1D
Demonstration — Part III
Latin
Cujuscunque humanæ mentis ideæ aliæ adæquatæ sunt, aliæ autem mutilatæ et confusæ (per scholia propositionis 40 partis II). Ideæ autem quæ in alicujus mente sunt adæquatæ, sunt in Deo adæquatæ quatenus ejusdem mentis essentiam constituit (per corollarium propositionis 11 partis II) et quæ deinde inadæquatæ sunt in mente, sunt etiam in Deo (per idem corollarium) adæquatæ non quatenus ejusdem solummodo mentis essentiam sed etiam quatenus aliarum rerum mentes in se simul continet. Deinde ex data quacunque idea aliquis effectus sequi necessario debet (per propositionem 36 partis I) cujus effectus Deus causa est adæquata (vide definitionem 1 hujus) non quatenus infinitus est sed quatenus data illa idea affectus consideratur (vide propositionem 9 partis II). At ejus effectus cujus Deus est causa quatenus affectus est idea quæ in alicujus mente est adæquata, illa eadem mens est causa adæquata (per corollarium propositionis 11 partis II). Ergo mens nostra (per definitionem 2 hujus) quatenus ideas habet adæquatas, quædam necessario agit, quod erat primum. Deinde quicquid necessario sequitur ex idea quæ in Deo est adæquata, non quatenus mentem unius hominis tantum sed quatenus aliarum rerum mentes simul cum ejusdem hominis mente in se habet, ejus (per idem corollarium propositionis 11 partis II) illius hominis mens non est causa adæquata sed partialis ac proinde (per definitionem 2 hujus) mens quatenus ideas inadæquatas habet, quædam necessario patitur. Quod erat secundum. Ergo mens nostra etc. Q.E.D.
English (Elwes 1883)
In every human mind there are some adequate ideas, and some ideas that are fragmentary and confused (II. xl. note). Those ideas which are adequate in the mind are adequate also in God, inasmuch as he constitutes the essence of the mind (II. xl. Coroll.), and those which are inadequate in the mind are likewise (by the same Coroll.) adequate in God, not inasmuch as he contains in himself the essence of the given mind alone, but as he, at the same time, contains the minds of other things. Again, from any given idea some effect must necessarily follow (I. 36); of this effect God is the adequate cause (III. Def. i.), not inasmuch as he is infinite, but inasmuch as he is conceived as affected by the given idea (II. ix.). But of that effect whereof God is the cause, inasmuch as he is affected by an idea which is adequate in a given mind, of that effect, I repeat, the mind in question is the adequate cause (II. xi. Coroll.). Therefore our mind, in so far as it has adequate ideas (III. Def. ii.), is in certain cases necessarily active; this was our first point. Again, whatsoever necessarily follows from the idea which is adequate in God, not by virtue of his possessing in himself the mind of one man only, but by virtue of his containing, together with the mind of that one man, the minds of other things also, of such an effect (II. xi. Coroll.) the mind of the given man is not an adequate, but only a partial cause; thus (III. Def. ii.) the mind, inasmuch as it has inadequate ideas, is in certain cases necessarily passive; this was our second point. Therefore our mind, &c. Q.E.D.
Modern English
In every human mind some ideas are adequate and some are fragmented and confused (E2P40S2). Ideas that are adequate in a given mind are adequate in God insofar as he constitutes the essence of that mind (E2P11C). Ideas that are inadequate in the mind are likewise adequate in God (E2P11C), not insofar as he contains the essence of that mind alone, but insofar as he also contains the minds of other things.
From any given idea some effect must necessarily follow (E1P36), and God is the adequate cause of that effect (E3D1), not insofar as he is infinite, but insofar as he is considered as affected by that given idea (E2P9). But where God is the adequate cause of an effect by virtue of an idea that is adequate in a given mind, that mind is itself the adequate cause (E2P11C). Therefore, our mind, insofar as it has adequate ideas, necessarily acts in certain respects. That was the first point.
Whatever necessarily follows from an idea that is adequate in God, not insofar as he contains the mind of one person only, but insofar as he contains the minds of other things together with that person's mind, of that, the mind of the given person is not the adequate cause but only the partial cause (E2P11C). Consequently, insofar as the mind has inadequate ideas, it necessarily undergoes passions (E3D1). That was the second point. Therefore our mind, etc. Q.E.D.