We need to make reparation for every sinful thought, word, deed, and omission on our part. Jesus Christ has redeemed every one of us by His death on the cross, but we still need to atone for all the sins we have committed after our baptism – we obtain indulgences, accept penances/trails patiently, do voluntary penances and good works to make reparation for our sins. Jesus redeemed all of us by dying on the cross, but by his death he did not obtain salvation for each and every one of us – this requires our own cooperation. Jesus’ death freed man from his sins and reopened the gates of Heaven, His redemption was universal; but redemption continues to this day on an individual level with the application of the merits of Jesus’ death towards every individual who enters newly into the world, through our co-redeeming meritorious prayers and works said and done for souls in union with the merits of Christ Passion and Death. God bless you.