As our acts or exercises differ from each other specifically, so also

the pleasures that are accessory to them differ specifically
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. On the other hand,
the pleasures attached to one exercise impede the mind in regard to
other exercises; thus men fond of the flute cannot listen to a speaker
with attention, if any one is playing the flute near them. What we
delight in doing, we are more likely to do well; what we feel pain in
doing, we are not likely to do well. And thus each variety of exercise
is alike impeded by the pains attached to itself, and by the pleasures
attached to other varieties.