linguistic:translation
Book X: Pleasure, happiness, and upbringing

Different activities—sense perceptions, thinking, contemplating—bring different kinds of pleasure, and these pleasures intensify the activities. Thus "for each activity has its own proper pleasure." For example a flute player gets better at playing while getting more pleasure from it. But these pleasures and their associated activities may impede each other, just as a flute player cannot participate in an argument while playing. This raises the question of which pleasures are to be pursued. Some pleasures are more beautiful and some are more base or corrupt. The pleasure a virtuous person feels from practicing virtue is a good pleasure; the pleasure a vicious person feels from practicing vice, less so (such "pleasures" hardly deserve the name).