Whether the angels differ in species?
Objections
❌ Objection 1 : It would seem that the angels do not differ in species. For since the "difference" is nobler than the 'genus,' all things which agree in what is noblest in them, agree likewise in their ultimate constitutive difference; and so they are the same according to species. But all angels agree in what is noblest in them---that is to say, in intellectuality. Therefore all the angels are of one species.
❌ Objection 2 : Further, more and less do not change a species. But the angels seem to differ only from one another according to more and less---namely, as one is simpler than another, and of keener intellect. Therefore the angels do not differ specifically.
❌ Objection 3 : Further, soul and angel are contra-distinguished mutually from each other. But all souls are of the one species. So therefore are the angels.
❌ Objection 4 : Further, the more perfect a thing is in nature, the more ought it to be multiplied. But this would not be so if there were but one individual under one species. Therefore there are many angels of one species.