Now the sequence is direct in a case such as that of courage and
cowardice: for upon the one of them virtue follows, and vice upon
the other; and upon the one it follows that it is desirable, while
upon the other it follows that it is objectionable. The sequence,
therefore, in the latter case also is direct; for the desirable is the
contrary of the objectionable. Likewise also in other cases. The
sequence is, on the other hand, converse in such a case as this:
Health follows upon vigour, but disease does not follow upon debility;
rather debility follows upon disease. In this case, then, clearly
the sequence is converse. Converse sequence is, however, rare in the
case of contraries; usually the sequence is direct. If, therefore, the
contrary of the one term does not follow upon the contrary of the
other either directly or conversely, clearly neither does the one term
follow upon the other in the statement made: whereas if the one
followed the other in the case of the contraries, it must of necessity
do so as well in the original statement.
You should look also into cases of the privation or presence of a
state in like manner to the case of contraries.
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