1. WE fast for three reasons.
(i) To check the desires of the flesh. So St. Paul says in fastings, in chastity (2 Cor. vi. 5), meaning that fasting is a safeguard for chastity. As St. Jerome says, “Without Ceres, and Bacchus, Venus would freeze,” as much as to say that lust loses its heat through spareness of food and drink.
(ii) That the mind may more freely raise itself to contemplation of the heights. We read in the book of Daniel that it was after a fast of three weeks that he received the revelation from God (Dan. x. 2-4).
(iii) To make satisfaction for sin. This is the reason given by the prophet Joel, Be converted to me with all your heart, in fasting and in weeping and in mourning (Joel ii. 12). And here is what St. Augustine writes on the matter. “Fasting purifies the soul. It lifts up the mind, and it brings the body into subjection to the spirit. It makes the heart contrite and humble, scatters the clouds of desire, puts out the flames of lust and the true light of chastity.”
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