Defined by St. Thomas (II-II:92:1) as "a vice opposed to religion by way of excess; not because in the worship of God it does more than true religion, but because it offers Divine worship to beings other than God or offers worship to God in an improper manner". Superstition sins by excess of religion, and this differs from the vice of irreligion, which sins by defect. The theological virtue of religion stands midway between the two. (II-II:92:1)
Division
There are four species of superstitions:
improper worship of the true God (indebitus veri Dei cultus);
idolatry;
divination;
vain observances, which include magic and occult arts.
The source of superstition is, in the first place, subjective. Ignorance of natural causes leads to the belief that certain striking phenomena express the will or the anger of some invisible overruling power, and the objects in which such phenomena appear are forthwith deified, as, e.g. in Nature-worship. Conversely, many superstitious practices are due to an exaggerated notion or a false interpretation of natural events, so that effects are sought which are beyond the efficiency of physical causes. Curiosity also with regard to things that are hidden or are still in the future plays a considerable part, e.g. in the various kinds of divination.
New Advent Encylopedia
