Invite by grace…

As God sees the world tottering to ruin because of fear, he acts unceasingly to bring it back by love, to invite it by grace, to hold it by charity and clasp it firmly with affection.
–Saint Peter Chrysologus (c. 380 – c. 450)

Prayer, fasting, and mercy…

There are three things, my brethren, by which faith stands firm, devotion remains constant, and virtue endures. They are prayer, fasting and mercy. Prayer knocks at the door, fasting obtains, mercy receives. Prayer, mercy and fasting: these three are one, and they give life to each other.
–Saint Peter Chrysologus (c. 380 – c. 450)

Mercy is to fasting…

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)