justice is ignorance, and if justly, is scientifically, and skilfully, the unjustly, is ignorantly, and unskilfully, and if these are not, neither are those, as in the case just now stated, for what is unjustly, would rather appear skilfully, than unskilfully, (done). Now this place has been mentioned before, in the consequences of contraries, for we do not now lay down any thing else, as a principle, than that the contrary follows the contrary.
Moreover, both by the subverter and the constructor, (arguments are to be derived) in generations and corruptions, efficients and destructives. For those things of which the generations are good, are themselves also good, and if they are good, the generations are too; but if the generations are of the number of things evil, the things themselves also are of evil. In corruptions, indeed, it is the contrary, for if corruptions are among the number of things good, the things themselves (corrupted) are evil, but if the corruptions are amongst things evil, the things themselves are good. The same reasoning indeed prevails in the case of efficients and destructives, for those things, of which the efficients are good, are themselves also good, but those, whose destructives are good, are themselves amongst things evil.
Chapter 10
Again, (it should be observed,) whether the same thing happens with similars, as if science is one
