Desire arising from the knowledge of good and evil, in so far as such knowledge regards what is future, may be more easily controlled or quenched, than the desire for what is agreeable at the present moment.
Proof .-- Emotion towards a thing, which we conceive as future, is fainter than emotion towards a thing that is present (IV.

ix.
Coroll.).

But desire, which arises from the true knowledge of good and evil, though it be concerned with things which are good at the moment, can be quenched or controlled by any headstrong desire (by the last Prop., the proof whereof is of universal application).

Wherefore desire arising from such knowledge, when concerned with the future, can be more easily controlled or quenched, &c.

Q.E.D.
PROP.XVII.