The avarice of mankind is insatiable.
Nature makes nothing incomplete, and nothing in vain.
Anything that we have to learn to do we learn by the actual doing of it; People become builders by building and instrumentalists by playing instruments. Similarily, we become just by performing just acts, temperate by performing temperate ones, brave by performing brave ones.
All art, all education, can be merely a supplement to nature.
Melancholy men, of all others, are the most witty.
If every tool, when ordered, or even of its own accord, could do the work that befits it... then there would be no need either of apprentices for the master workers or of slaves for the lords.