P29: In nature there is nothing contingent, but all things have been determined from the necessity of the Divine/Universal nature to exist and produce an effect in a certain way.

Dem.: Whatever is, is in God/Nature (by P15); but God/Nature cannot be called a contingent thing. For (by P11) he exists necessarily, not contingently. Next, the modes of the Divine/Universal nature have also followed from it necessarily and not contingently (by P16)—either insofar as the Divine/Universal nature is considered absolutely (by P21) or insofar as it is considered to be determined to act in a certain way (by P28). Further, God/Nature is the cause of these modes not only insofar as they simply exist (by P24 C), but also (by P26) insofar as they are considered to be determined to produce an effect. For if they have not been determined by God/Nature, then (by P26) it is impossible, not contingent, that they should determine themselves. Conversely (by P27) if they have been determined by God/Nature, it is not contingent, but impossible, that they should render themselves undetermined. So all things have been determined from the necessity of the Divine/Universal nature, not only to exist, but to exist in a certain way, and to produce effects in a certain way. There is nothing contingent, q.e.d.

Schol.: Before I proceed further, I wish to explain here—or rather to advise {the reader}—what we must understand by Natura naturans and Natura naturata. For from the preceding I think it is already established that by Natura naturans we must understand what is in itself and is conceived through itself, or such attributes of substance as express an eternal and infinite essence, i.e. (by P14 C1 and P17 C2), God/Nature, insofar as he is considered as a free cause.

But by Natura naturata I understand whatever follows from the necessity of God/Nature’s nature, or from any of God/Nature’s attributes, i.e., all the modes of God/Nature’s attributes insofar as they are considered as things which are in God/Nature, and can neither be nor be conceived without God/Nature.