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Jesus Christ gave his disciples (by extension, priests) the power not only to "loose" sins (i.e., forgive in god's name), but also to "bind" (i.e., impose penances: Matthew 16:19, 18:18; John 20:23), as the representatives of God and ambassadors of His mercy. The absolution imparted by the priest is not a mere expression of hope but a sacramental, objective reality. One also learns humility by this practice, receives additional grace in order to avoid sin, and attains a certainty of forgivenes, which is superior to the mere subjective feelings. This Catholic practice is frimly grounded in Scripture and early and constant Christian Tradition.
Catholics are required to repent of (contrition) and confess all mortal, or grave, sins to a priest, in order to be absolved. The priest assings a penance (satisfaction), which removes the temporal punishment of sin. The famous Catholic writer G.K. Chesterton wrote:
"...the Church deduces that sin confessed and adequately repented is actualy abolished; and that the sinner does really begin again as if he had never sinned...God has really remade him in His own image. He is now a new experiment of the Creator. He is as much a new experiment as he was when he was really only five years old."
With his every deed he offered thanks to God Most High,
in words of praise.
in words of praise.
With his whole being he loved his Maker
and daily had his praises sung...
and daily had his praises sung...
The Lord forgave him his sins and exalted his strength forever...
Sirach 47:8 and 11
(Other Related Scripture: Leviticus 19:20-22; Numbers 5:607; Psalms 32:5: Proverbs 28:13; Isaiah 43:25; Matthew 3:5-6; Mark 1:5; Luke 15:18-19; John 20:21-23; Acts 19:18; 2 Corinthians 5:8-20; James 5;16; 1 John 1:8-9)
Disclaimer: I am not the author of the above. All information came out of "The Catholic Answer Bible" version of The New American Bible.