Some writers extend this term to all the supernatural virtues, or rather to the acts of all these virtues, inasmuch as they are the results of the mysterious workings of the Holy Ghost in our souls by means of His grace. But, with St. Thomas, I-II, Q. lxx, a. 2, the word is ordinarily restricted to mean only those supernatural works that are done joyfully and with peace of soul. This is the sense in which most authorities apply the term to the list mentioned by St. Paul (Galatians 5:22-23): “But the fruit of the Spirit is, charity, joy, peace, patience, benignity, goodness, longanimity, mildness, faith, modesty, continency, chastity.” Moreover, there is no doubt that this list of twelve — three of the twelve are omitted in several Greek and Latin manuscripts — is not to be taken in a strictly limited sense, but, according to the rules of Scriptural language, as capable of being extended to include all acts of a similar character. That is why the Angelic Doctor says: “Every virtuous act which man performs with pleasure is a fruit.” The fruits of the Holy Ghost are not habits, permanent qualities, but acts. They cannot, therefore, be confounded with the virtues and the gifts, from which they are distinguished as the effect is from its cause, or the stream from its source. The charity, patience, mildness, etc., of which the Apostle speaks in this passage, are not then the virtues themselves, but rather their acts or operations; for, however perfect the virtues may be, they cannot be considered as the ultimate effects of grace, being themselves intended, inasmuch as they are active principles, to produce something else, i.e. their acts. Further, in order that these acts may fully justify their metaphorical name of fruits, they must belong to that class which are performed with ease and pleasure; in other words, the difficulty involved in performing them must disappear in presence of the delight and satisfaction resulting from the good accomplished. 1914 Catholic Encyclopedia
The original author of this blog passed away in July of 2016. RIP Father Carota.