Psalms 50:5-7 For I know my iniquity, and my sin is ever before me.  Against you only have I sinned, and I have done evil before your eyes. And so, you are justified in your words, and you will prevail when you give judgment. For behold, I was conceived in iniquities, and in sinfulness did my mother conceive me.

The psalmist identifies the sin that he is effected by. He acknowledge Original sin, which we inherited from Adam and Eve. I am born with this alienation from God. But with this he admits his own sins, chosen by him, which keeps him away from God. He realizes that God is justified in pointing out our sins to us. With St. Paul we can cry out, "Who can deliver us from this state? With St. Paul in faith we know that Jesus through his death and resurrection has reconciled us back to God. In baptism we are freed from Original Sin. In the Sacrament of Reconciliation we are forgiven our personal sins. What should our response be? Gratitude and determination to live free from sin, so as to share in God's divine life. That is why this Holy Week is special for us, as Christians. We remember and enter into the mystery of our salvation and new life.