Whatsoever we conceive to be in the power of God, necessarily exists.
Proof .-- Whatsoever is in God's power, must (by the last Prop.) be comprehended in his essence in such a manner, that it necessarily follows therefrom, and therefore necessarily exists.
Q.E.D.
PROP.XXXVI.

There is no cause from whose nature some effect does not follow.
Proof .-- Whatsoever exists expresses God's nature or essence in a given conditioned manner (by Prop.xxv., Coroll.); that is, (by Prop.

xxxiv.), whatsoever exists, expresses in a given conditioned manner God's power, which is the cause of all things, therefore an effect must (by Prop.

xvi.) necessarily follow.
Q.E.D.
APPENDIX: In the foregoing I have explained the nature and properties of God.

I have shown that he necessarily exists, that he is one: that he is, and acts solely by the necessity of his own nature; that he is the free cause of all things, and how he is so; that all things are in God, and so depend on him, that without him they could neither exist nor be conceived; lastly, that all things are predetermined by God, not through his free will or absolute fiat, but from the very nature of God or infinite power.
I have further, where occasion afforded, taken care to remove the prejudices, which might impede the comprehension of my demonstrations.