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I mention the two, because the same does not hold with regard to

States whether of mind or body as with regard to Sciences or

Faculties: I mean that whereas it is thought that the same

Faculty or Science embraces contraries, a State will not: from

health, for instance, not the contrary acts are done but the

healthy ones only; we say a man walks healthily when he walks as

the healthy man would.

However, of the two contrary states the one may be frequently

known from the other, and oftentimes the states from their

subject-matter: if it be seen clearly what a good state of body

is, then is it also seen what a bad state is, and from the things

which belong to a good state of body the good state itself is

seen, and vice versa. If, for instance, the good state is

firmness of flesh it follows that the bad state is flabbiness of

flesh; and whatever causes firmness of flesh is connected with

the good state.