BigMack
This is what St. Jerome means when, quoting Terence, he says: Sine Cerere et Baccho, friget Venus (Cont. Jov., II, 6), or, to use the words of St. Thomas (II-II, q. cxlvii, art. 1), "the ardor of lust is dampened by abstinence from food and drink." Besides, abstinence exercises a salutary influence in leading man to suprasensible pursuits. For, according to St. Augustine (De oratione et jejunio, sermo ccxxx, de temp.), abstinence purifies the soul, elevates the mind, subordinates the flesh to the spirit, begets a humble and contrite heart, scatters the clouds of concupiscence, extinguishes the fire of lust, and enkindles the true light of chastity.
This is summarized in the official message of the Church found in the Mass-preface used during Lent: "Who by bodily fasting suppresses vice, ennobles the mind, grants virtue and rewards." It is no exaggeration, therefore, to maintain that Christians must find in abstinence an efficacious means to repair the losses of the spirit and augment its gains. Inspired by such motives, the Church wisely prohibits the use of flesh meat at duly appointed times.
Seemingly harsh, the law of abstinence, in its last analysis, serves to promote bodily and spiritual well-being. The mechanism of the body stamps man as an omnivorous animal. Hence, all nations have adopted a mixed diet. Nay. more, a priori and a posteriori reasons prove that the occasional interruption of meat diet conduces to bodily and spiritual health. In case of less rugged constitutions, the Church tempers the rigors of her legislation with the mildness of her dispensations.
Finally, the experience of nineteen centuries proves that transgression of this law neither promotes health nor prolongs life. Hence, consummate wisdom and prudence, seeking to safeguard the welfare of soul and body, inspire the Church in her laws pertaining to abstinence. (See ADVENT; LENT)