1213 HOLY BAPTISM IS THE BASIS OF THE WHOLE CHRISTIAN LIFE, THE GATEWAY TO LIFE IN THE SPIRIT (vitae spiritualis iamua) , AND THE DOOR WHICH GIVES ACCESS TO THE OTHER SACRAMENTS.  THROUGH BAPTISM WE ARE FREED FROM SIN AND REBORN AS SONS OF  GOD;  WE BECOME MEMBERS OF CHRIST, ARE INCORPORATED INTO THE CHURCH AND MADE SHARERS IN HER MISSION: "BAPTISM IS THE SACRAMENT OF REGENERATION THROUGH WATER IN THe worD"
  1279 the fruit of baptism, or baptismal grace, is a rich reality that includes forgiveness of original sin and all personal sins, birth into the new life by which man becomes an adoptive son of the father, a member of Christ and a temple of the holy spirit.  by this very fact, the person baptized is incorporated into the church, the body of christ, and made a sharer in the priesthood of christ.

 

(excerpts taken from the Catechism of the Catholic Church; 

copyright © 1994 Concacan Inc., Canada)