P36: Nothing exists from whose nature some effect does not follow.

Dem: Whatever exists expresses the nature, or essence of God/Nature in a certain and determinate way (by P25 C), i.e. (by P34), whatever exists expresses in a certain and determinate way the power of God/Nature, which is the cause of all things. So (by P16), from {everything that exists} some effect must follow, q.e.d.