Remember, temporal punishment is corrective and purifying. In the West, we refer to the need for us to make satisfaction for our sins–in the East, they would say we need to bring forth the proper fruits of repetence (in fact, both phrases are used by the ecumenical Council of Florence–a reunion Council between East and West)–but it is the same meaning.
Council of Florence:
Also, if truly penitent people die in the love of God before they have made satisfaction for acts and omissions by worthy fruits of repentance, their souls are cleansed after death by cleansing pains; and the suffrages of the living faithful avail them in giving relief from such pains, that is, sacrifices of masses, prayers, almsgiving and other acts of devotion which have been customarily performed by some of the faithful for others of the faithful in accordance with the church’s ordinances.
Anyway, here is the principle of temporal punishment explained in the New Testament–notice especially the last verse and its linking temporal punishment to justice:
Hebrews 12:6 For whom the Lord loveth, he chastiseth; and he scourgeth every son whom he receiveth.
7 Persevere under discipline. God dealeth with you as with his sons; for what son is there, whom the father doth not correct?
8 But if you be without chastisement, whereof all are made partakers, then are you bastards, and not sons.
9 Moreover we have had fathers of our flesh, for instructors, and we reverenced them: shall we not much more obey the Father of spirits, and live?
10 And they indeed for a few days, according to their own pleasure, instructed us: but he, for our profit, that we might receive his sanctification.
11 Now all chastisement for the present indeed seemeth not to bring with it joy, but sorrow: but afterwards it will yield, to them that are exercised by it, the most peaceable fruit of justice.
edit: just to add, while the rendering from the Latin in the DRV gives the phrase “do penance” it means the same as the phrase “repent.” As Catholics, we understanding that repentence is more than just contrition–it is contrition, confession, and satisfaction.