I must say that we Christians, even in recent times, have often avoided the word ‘penance,’ which seemed too harsh to us. Now, under the attacks of the world that speaks to us of our sins, we see that being able to do penance is a grace and we see how it is necessary to do penance, that is, to recognize what is mistaken in our life, to open oneself to forgiveness, to prepare oneself for forgiveness, to allow oneself to be transformed. The pain of penance, that is to say of purification and of transformation, this pain is grace, because it is renewal, and it is the work of Divine Mercy.
-- Pope Benedict XVI