usceptible of
more or less, he says: "Things which are given the nature of a
triangle or a circle, are accordingly triangles and circles": to wit,
because indivisibility is essential to the motion of such, wherefore
whatever participates their nature must participate it in its
indivisibility.

It is clear, therefore, since we speak of habits and dispositions in
respect of a relation to something (Phys. vii, text. 17), that in two
ways intensity and remission may be observed in habits and
dispositions. First, in respect of the habit itself: thus, for
instance, we speak of greater or less health; greater or less
science, which extends to more or fewer things. Secondly, in respect
of participation by the subject: in so far as equal science or health
is participated more in one than in another, according to a diverse
aptitude arising either from nature, or from custom. For habit and
disposition do not give species to the subject: nor again do they
essentially imply indivisibility.

We shall say further on (Q. 66, A. 1) how it is with the virtues.

Reply Obj. 1: As the word "great" is taken from corporeal quantities
and applied to the intelligible perfections of forms; so also is the
word "growth," the term of which is something great.

Reply Obj. 2: Habit is indeed a perfection, but not a perfection
which is the term of its subject; for instance, a term giving the
subject its specific being. Nor again does the nature of a habit
include the notion of term, as do the species of numbers. Wherefore
there is nothing to hinder it from being susceptible of more or less.

Reply Obj. 3: Alteration is primarily indeed in the qualities of the
third species; but secondarily it may be in the qualities of the
first species: for, supposing an alteration as to hot and cold, there
follows in an animal an alteration as to health and sickness. In like
manner, if an alteration take place in the passions of the sensitive
appetite, or the sensitive powers of apprehension, an alteration
follows as to science and virtue (Phys. viii, text. 20).
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SECOND ARTICLE [I-II, Q. 52, Art. 2]

Whether Habit Increases by Addition?

Objection 1: It would seem that the increase of habits is by way of
addition. For the word "increase," as we have said, is transferred to
forms, from corporeal quantities. But in corporeal quantities there
is no increase without addition: wherefore (De Gener. i, text. 31) it
is said that "increase