To make these acceptable, mercy must be added. Fasting bears no fruit unless it is watered by mercy. Fasting dries up when mercy dries up. Mercy is to fasting as rain is to earth. However much you may cultivate your heart, clear the soil of your nature, root out vices, sow virtues, if you do not release the springs of mercy, your fasting will bear no fruit.
–Saint Peter Chrysologus (c. 380 – c. 450)
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