Property on the other hand with relation to another, is that which does not separate from every thing, but from a certain definite thing, as of virtue in regard to science, the property is that the one is naturally adapted to be in many, but the other in the reasoning faculty alone, and in those who possess the reasoning faculty. Again, the property "always" is that which is true at all times and never fails, as of animal to be composed of soul and body, but the property "sometimes" is that which is true at a certain time, yet does not always follow from necessity, as of a certain man to walk in the Forum.
We may however assign property with reference to something else, when we assert that difference is either in all and always, or for the most part, and in most, for instance, in all and always, as the property of man with respect to horse is the being biped, for both always and every man is a biped, but no horse is ever a biped. For the most part and in most, as the property of the rational in regard to the appetitive and irascible part, is that the one commands, but the other obeys, since neither does the rational always govern, but sometimes is also governed, nor are the appetitive and irascible always governed, but sometimes also govern when a man's soul is depraved.
Of properties however those are especially logical, which are per se, and always, with reference to something else. For the property with reference to something else produces many problems, as also we observed before, since either two or four problems arise from necessity, wherefore many arguments originate in reference to these. Still we may argue about what is per se and always, in reference to many things, or observe it with regard to many times, what is per se indeed, with reference to many things, for it is necessary that property should be present with a subject in regard to each thing that exists, so that if it is not separated as to all, it would not be well assigned as property. But we may observe that which is always, with regard to many times, and both whether it is not present, or was not present, or will not be present, it will not be property. But the property at
