tion or movement: thus the building is
the complete generation of a house, while the laying of the
foundations, and the setting up of the walls are incomplete species,
as the Philosopher declares (Ethic. x, 4); and the same can apply to
the generation of animals. Accordingly sins are divided into these
three, viz. sins of thought, word, and deed, not as into various
complete species: for the consummation of sin is in the deed,
wherefore sins of deed have the complete species; but the first
beginning of sin is its foundation, as it were, in the sin of
thought; the second degree is the sin of word, in so far as man is
ready to break out into a declaration of his thought; while the third
degree consists in the consummation of the deed. Consequently these
three differ in respect of the various degrees of sin. Nevertheless
it is evident that these three belong to the one complete species of
sin, since they proceed from the same motive. For the angry man,
through desire of vengeance, is at first disturbed in thought, then
he breaks out into words of abuse, and lastly he goes on to wrongful
deeds; and the same applies to lust and to any other sin.

Reply Obj. 1: All sins of thought have the common note of secrecy, in
respect of which they form one degree, which is, however, divided
into three stages, viz. of cogitation, pleasure, and consent.

Reply Obj. 2: Sins of words and deed are both done openly, and for
this reason Gregory (Moral. iv, 25) reckons them under one head:
whereas Jerome (in commenting on Ezech. 43:23) distinguishes between
them, because in sins of word there is nothing but manifestation
which is intended principally; while in sins of deed, it is the
consummation of the inward thought which is principally intended, and
the outward manifestation is by way of sequel. Habit and despair are
stages following the complete species of sin, even as boyhood and
youth follow the complete generation of a man.

Reply Obj. 3: Sin of thought and sin of word are not distinct from
the sin of deed when they are united together with it, but when each
is found by itself: even as one part of a movement is not distinct
from the whole movement, when the movement is continuous, but only
when there is a break in the movement.
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EIGHTH ARTICLE [I-II, Q. 72, Art. 8]

Whether Excess and Deficiency Diversify the Species of Sins?

Objection 1: It would seem that excess and deficiency do not
diversify the spe