Each has its accessory and consummating mode of pleasure; and to say that all men desire pleasure, is the same as saying that all men desire life.

It is no real question to ask--Do we choose life for the sake of pleasure, or pleasure for the sake of life?
The truth is, that the two are implicated and inseparable (IV.).
As our acts or exercises differ from each other specifically, so also the pleasures that are accessory to them differ specifically.

Exercises intellectual differ from exercises perceptive, and under each head there are varieties differing from each other.

The pleasures accessory and consummating to each, are diversified accordingly.

Each pleasure contributes to invigorate and intensify the particular exercise that it is attached to; the geometer who studies his science with pleasure becomes more acute and successful in prosecuting it.