Quote:
Originally Posted by
Unknown008
Wait wait wait. I was talking of water baptism, as the 'part' water baptism. I was referring only to the part of baptism, which is water baptism. I know that only Jesus baptizes by the Holy Spirit, and I have clearly said that in previous posts. I was only saying that water baptism is done by man, the baptism of the Holy Spirit by Jesus. Baptism, as a whole, does require both baptism by water and baptism by the Holy Spirit.
A sacrament is an exterior** action ('work' in your vernacular) of an interior change instituted by God. Baptism is a sacrament. Christ mandated baptism – see Matthew 28. The interior change is the spiritual graces that work with the free will and conveyed by the Holy Spirit. As stated above (Question 62, Article 1), sacraments derive from their institution the power of conferring grace. Wherefore it seems that a sacrament is then instituted, when it receives the power of producing its effect. Now Baptism received this power when Christ was baptized. Consequently Baptism was truly instituted then, if we consider it as a sacrament. But the obligation of receiving this sacrament was proclaimed to mankind after the Passion and Resurrection. First, because Christ's Passion put an end to the figurative sacraments, which were supplanted by Baptism and the other sacraments of the New Law. Secondly, because by Baptism man is "made conformable" to Christ's Passion and Resurrection, in so far as he dies to sin and begins to live anew unto righteousness. Consequently it behooved Christ to suffer and to rise again, before proclaiming to man his obligation of conforming himself to Christ's Death and Resurrection. St. Thomas Aquinas , The Summa Theologica III, 66,2
SUMMA THEOLOGICA: The sacrament of Baptism (Tertia Pars, Q. 66)