P16: A Desire which arises from a true knowledge of good and evil, insofar as this knowledge concerns the future, can be quite easily restrained or extinguished by a Desire for the pleasures of the moment.

Dem.: An affect toward a thing we imagine as future is milder than one toward a present thing (by P9 C). But a Desire which arises from a true knowledge of good and evil, even if this knowledge concerns things which are good now, can be restrained or extinguished by some rash Desire (by P15, whose demonstration is universal). Therefore, a Desire which arises from the same knowledge, insofar as this concerns a future thing, can be quite easily restrained or extinguished, etc., q.e.d.