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In Christian theology, justification is God's act making a sinner righteous before Him by His grace, received through the faith given to the person by God, for Christ's sake, because of his life, death, and resurrection.
The relationship of justification to atonement, the expiation of sins.
In the Catholic religion, justification is produced through the sacraments, and must be intitated by the sacrament of baptism or the desire for it (Council of Trent, Canon 4).