P30: Insofar as our Mind knows itself and the Body under a species of eternity, it necessarily has knowledge of God/Nature, and knows that it is in God/Nature and is conceived through God/Nature.

Dem.: Eternity is the very essence of God/Nature insofar as this involves necessary existence (by ID8). To conceive things under a species of eternity, therefore, is to conceive things insofar as they are conceived through God/Nature’s essence, as real beings, or insofar as through God/Nature’s essence they involve existence. Hence, insofar as our Mind conceives itself and the Body under a species of eternity, it necessarily has knowledge of God/Nature, and knows, etc., q.e.d.