the
Flesh?

Objection 1: It would seem that blindness of mind and dulness of
sense do not arise from sins of the flesh. For Augustine (Retract. i,
4) retracts what he had said in his Soliloquies i, 1, "God Who didst
wish none but the clean to know the truth," and says that one might
reply that "many, even those who are unclean, know many truths." Now
men become unclean chiefly by sins of the flesh. Therefore blindness
of mind and dulness of sense are not caused by sins of the flesh.

Obj. 2: Further, blindness of mind and dulness of sense are defects
in connection with the intellective part of the soul: whereas carnal
sins pertain to the corruption of the flesh. But the flesh does not
act on the soul, but rather the reverse. Therefore the sins of the
flesh do not cause blindness of mind and dulness of sense.

Obj. 3: Further, all things are more passive to what is near them
than to what is remote. Now spiritual vices are nearer the mind than
carnal vices are. Therefore blindness of mind and dulness of sense
are caused by spiritual rather than by carnal vices.

_On the contrary,_ Gregory says (Moral. xxxi, 45) that dulness of
sense arises from gluttony and blindness of mind from lust.

_I answer that,_ The perfect intellectual operation in man consists in
an abstraction from sensible phantasms, wherefore the more a man's
intellect is freed from those phantasms, the more thoroughly will it
be able to consider things intelligible, and to set in order all
things sensible. Thus Anaxagoras stated that the intellect requires to
be "detached" in order to command, and that the agent must have power
over matter, in order to be able to move it. Now it is evident that
pleasure fixes a man's attention on that which he takes pleasure in:
wherefore the Philosopher says (Ethic. x, 4, 5) that we all do best
that which we take pleasure in doing, while as to other things, we do
them either not at all, or in a faint-hearted fashion.

Now carnal vices, namely gluttony and lust, are concerned with
pleasures of touch in matters of food and sex; and these are the most
impetuous of all pleasures of the body. For this reason these vices
cause man's attention to be very firmly fixed on corporeal things, so
that in consequence man's operation in regard to intelligible things
is weakened, more, however, by lust than by gluttony, forasmuch as
sexual pleasures are more vehement than those of the table. Wherefore
lust gives rise to blindness o