This section is long, but worth reading. Note that all these quotations are found in the same section, found here. All the bold on these last few posts are my highlights.
As to angels changing the senses, I know for a fact that my guardian angels have helped me to fast and to keep fasting at certain times. This is a subtle movement of the senses regarding food, feeling hungry, or not feeling hungry.
If we really want our angels to help us become holy, they are more than willing. But, they may have to help us overcome the matter of sin, through our cooperation with discipline and prayer. Anything, such a art or a design, a song, or a view, can lead us to holiness or sin. The senses become more sensitive the more we pray, and for the good.
Article 4. Whether an angel can change the human senses?
Objection 1. It seems that an angel cannot change the human senses. For the sensitive operation is a vital operation. But such an operation does not come from an extrinsic principle. Therefore the sensitive operation cannot be caused by an angel.Objection 2. Further, the sensitive operation is nobler than the nutritive. But the angel cannot change the nutritive power, nor other natural forms. Therefore neither can he change the sensitive power.
Objection 3. Further, the senses are naturally moved by the sensible objects. But an angel cannot change the order of nature (110, 4). Therefore an angel cannot change the senses; but these are changed always by the sensible object.
On the contrary, The angels who overturned Sodom, "struck the people of Sodom with blindness oraorasia, so that they could not find the door" (Genesis 19:11). [It is worth noting that these are the only two passages in the Greek version where the word aorasia appears. It expresses, in fact, the effect produced on the people of Sodom--namely, dazzling (French version, "eblouissement"), which the Latin "caecitas" (blindness) does not necessarily imply.] The same is recorded of the Syrians whomEliseus led into Samaria (2 Kings 6:18).
I answer that, The senses may be changed in a twofold manner; from without, as when affected by the sensible object: and from within, for we see that the senses are changed when the spirits and humors are disturbed; as for example, a sick man's tongue, charged with choleric humor, tastes everything as bitter, and the like with the other senses. Now an angel, by his natural power, can work a change in the senses both ways. For an angel can offer the senses a sensible object from without, formed by nature or by the angel himself, as when he assumes a body, as we have said above (Question 51, Article 2). Likewise he can move the spirits and humors from within, as above remarked, whereby the senses are changed in various ways.
Reply to Objection 1. The principle of the sensitive operation cannot be without the interior principle which is the sensitive power; but this interior principle can be moved in many ways by the exterior principle, as above explained.
Reply to Objection 2. By the interior movement of the spirits and humors an angel can do something towards changing the act of the nutritive power, and also of the appetitive and sensitive power, and of any other power using a corporeal organ.
Reply to Objection 3. An angel can do nothing outside the entire order of creatures; but he can outside some particular order of nature, since he is not subject to that order; thus in some special way an angel can work a change in the senses outside the common mode of nature.
