On fasting

"Our Lord knew that to draw strength and efficacy from fasting, something more than abstinence from prohibited food is necessary. Thus He instructed His disciples and, consequently, disposed them to gather the fruits proper to fasting. Among many others are these four: fasting fortifies the spirit, mortifying the flesh and its sensuality; it raises the spirit to God; it fights concupiscence and gives power to conquer and deaden its passions; in short, it disposes the heart to seek to please only God with great purity of heart." (St. Francis de Sales)