But the soul has such a state of being, as enables it to suffer this, what, however, we have before said, but not clearly, let us again explain. When one thing without difference abides, there is (then) first, universal in the soul, (for the singular indeed is perceived by sense, but sense is of the universal, as of man, but not of the man Callias,) again, in these it stops, till individuals and universals stop, as such a kind of animal, until animal, and in this again (it stops) after a similar manner. It is manifest then that primary things become necessarily known to us by induction, for thus sensible perception produces the universal. But since, of those habits which are about intellect, by which we ascertain truth, some are always true, but others admit the false, as opinion, and reasoning, but science, and intellect, are always true, and no other kind of knowledge, except intellect, is more accurate than science, but the principles of demonstrations are more known, and all science is connected with reason, there could not be a science of principles: but since nothing can be more true than science except intellect,
