Reply Obj. 1:  The end also has the character of an object, as stated above.

Reply Obj. 2:  Although it is accidental to the external action to be ordained to some particular end, it is not accidental to the interior act of the will, which act is compared to the external act, as form to matter.

Reply Obj. 3:  When many actions, differing in species, are ordained to the same end, there is indeed a diversity of species on the part of the external actions; but unity of species on the part of the internal action. ________________________

SEVENTH ARTICLE [I-II, Q. 18, Art. 7]

Whether the Species Derived from the End Is Contained Under the
Species Derived from the Object, As Under Its Genus, or Conversely?

Objection 1:  It would seem that the species of goodness derived from the end is contained under the species of goodness derived from the object, as a species is contained under its genus; for instance, when a man commits a theft in order to give alms.  For an action takes its species from its object, as stated above (AA. 2, 6).  But it is impossible for a thing to be contained under another species, if this species be not contained under the proper species of that thing; because the same thing cannot be contained in different species that are not subordinate to one another.  Therefore the species which is taken from the end, is contained under the species which is taken from the object.

Obj. 2:  Further, the last difference always constitutes the most specific species.  But the difference derived from the end seems to come after the difference derived from the object:  because the end is something last.  Therefore the species derived from the end, is contained under the species derived from the object, as its most specific species.

Obj. 3:  Further, the more formal a difference is, the more specific it is:  because difference is compared to genus, as form to matter.  But the species derived from the end, is more formal than that which is derived from the object, as stated above (A. 6).  Therefore the species derived from the end is contained under the species derived from the object, as the most specific species is contained under the subaltern genus.

On the contrary, Each genus has its determinate differences.  But an action of one same species on the part of its object, can be ordained to an infinite number of ends:  for instance, theft can be ordained to an infinite number of good and bad ends.  Therefore the species derived from the end is not contained under the species derived from the object, as under its genus.