Leo the Great

Devout fasting has a very great value for gaining the mercy of God and for strengthening human frailty. We know this from the teaching of holy prophets, dearly beloved. They insist that the arousal of divine justice—which the people of Israel frequently brought upon themselves in punishment for their wickedness—could not be placated except by fasting. Joel the prophet warns us in saying, “The Lord God says these things: ‘Turn to me with all your heart, in fasting, in weeping and in mourning. Rend your hearts, and not your garments. Be converted to the Lord your God, because he is merciful and patient and magnanimous and rich in mercy.’ ” At another point, the same prophet says, “Make a holy fast, preach healing, call together the people, make holy the assembly.” This exhortation, dearly beloved, is what we must embrace in our times also. We must of necessity preach the remedy of this healing, so that Christian devotion in the observance of that ancient means for sanctification might acquire what the Jewish transgression lost.