A wise and good person works with their own mind. A doctor works with the body. A trainer works with athletes. A farmer works with land. The job of a wise and good person is to handle impressions the right way. Here's what's natural for every soul: to agree with what's true, reject what's false, and stay undecided about uncertain things. It's also natural to want good things and avoid bad things.
The material for the wise and good man is his own ruling faculty: and the body is the material for the physician and the aliptes (the man who oils persons); the land is the matter for the husbandman. The business of the wise and good man is to use appearances conformably to nature: and as it is the nature of every soul to assent to the truth, to dissent from the false, and to remain in suspense as to that which is uncertain; so it is its nature to be moved towards the desire for the good, and to aversion from the evil;