Apostolic Constitution of Pope Paul VI: Indulgentiarum Doctrina: Whereby The Revision of Sacred Indulgences is Promulgated

An excerpt from Indulgentiarum Doctrina, Chapter 1:

3. It is therefore necessary for the full remission and—as it is called—reparation of sins not only that friendship with God be reestablished by a sincere conversion of the mind and amends made for the offense against his wisdom and goodness, but also that all the personal as well as social values and those of the universal order itself, which have been diminished or destroyed by sin, be fully reintegrated whether through voluntary reparation which will involve punishment or through acceptance of the punishments established by the just and most holy wisdom of God, from which there will shine forth throughout the world the sanctity and the splendor of his glory. The very existence and the gravity of the punishment enable us to understand the foolishness and malice of sin and its harmful consequences.

That punishment or the vestiges of sin may remain to be expiated or cleansed and that they in fact frequently do even after the remission of guilt(8) is clearly demonstrated by the doctrine on purgatory. In purgatory, in fact, the souls of those "who died in the charity of God and truly repentant, but before satisfying with worthy fruits of penance for sins committed and for omissions (9) are cleansed after death with purgatorial punishments. This is also clearly evidenced in the liturgical prayers with which the Christian community admitted to Holy Communion has addressed God since most ancient times: "that we, who are justly subjected to afflictions because of our sins, may be mercifully set free from them for the glory of thy name.(10)

Scipture tells us Who was subjected to afflictions because of our sins:
Isaiah 53

1 Who has believed our report?
And to whom has the arm of the LORD been revealed?
2 For He shall grow up before Him as a tender plant,
And as a root out of dry ground.
He has no form or comeliness;
And when we see Him,
There is no beauty that we should desire Him.
3 He is despised and rejected by men,
A Man of sorrows and acquainted with grief.
And we hid, as it were, our faces from Him;
He was despised, and we did not esteem Him.
4 Surely He has borne our griefs
And carried our sorrows;
Yet we esteemed Him stricken,
Smitten by God, and afflicted.
5 But He was wounded for our transgressions,
He was bruised for our iniquities;
The chastisement for our peace was upon Him,
And by His stripes we are healed.
6 All we like sheep have gone astray;
We have turned, every one, to his own way;
And the LORD has laid on Him the iniquity of us all.
7 He was oppressed and He was afflicted,
Yet He opened not His mouth;
He was led as a lamb to the slaughter,
And as a sheep before its shearers is silent,
So He opened not His mouth.
8 He was taken from prison and from judgment,
And who will declare His generation?
For He was cut off from the land of the living;
For the transgressions of My people He was stricken.
9 And they made His grave with the wicked—
But with the rich at His death,
Because He had done no violence,
Nor was any deceit in His mouth.
10 Yet it pleased the LORD to bruise Him;
He has put Him to grief.
When You make His soul an offering for sin,
He shall see His seed, He shall prolong His days,
And the pleasure of the LORD shall prosper in His hand.
11 He shall see the labor of His soul,and be satisfied.
By His knowledge My righteous Servant shall justify many,
For He shall bear their iniquities.
12 Therefore I will divide Him a portion with the great,
And He shall divide the spoil with the strong,
Because He poured out His soul unto death,
And He was numbered with the transgressors,
And He bore the sin of many,
And made intercession for the transgressors.

Scripture tells us Who 'has wiped out the handwriting of requirements that was against us...and has taken it out of the way, having nailed it to the cross'; we who no longer bear any guilt will receive no punishment because He was afflicted for us:

Colossians 2:8 Beware lest anyone cheat you through philosophy and empty deceit, according to the tradition of men, according to the basic principles of the world, and not according to Christ. 9 For in Him dwells all the fullness of the Godhead bodily; 10 and you are complete in Him, who is the head of all principality and power.
11 In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins of the flesh, by the circumcision of Christ, 12 buried with Him in baptism, in which you also were raised with Him through faith in the working of God, who raised Him from the dead. 13 And you, being dead in your trespasses and the uncircumcision of your flesh, He has made alive together with Him, having forgiven you all trespasses, 14 having wiped out the handwriting of requirements that was against us, which was contrary to us. And He has taken it out of the way, having nailed it to the cross. 15 Having disarmed principalities and powers, He made a public spectacle of them, triumphing over them in it.