The Council of Trent was a key event in the so-called Roman Catholic “counter reformation.” It was held in Trento, Italy, from 1545 – 1563. This excerpt is from Trent’s remarks about baptism:1
CANON I.—If any one saith, that the baptism of John had the same force as the baptism of Christ: let him be anathema.
CANON II.—If any one saith, that true and natural water is not of necessity for baptism, and, on that account, wrests, to some sort of metaphor, those words of our Lord Jesus Christ: Unless a man be born again of water and the Holy Ghost:1 let him be anathema.
CANON III.—If any one saith, that in the Roman Church, which is the mother and mistress of all churches, there is not the true doctrine concerning the sacrament of baptism: let him be anathema.
CANON IV.—If any one saith, that the baptism which is even given by heretics in the name of the Father, and of the Son, and of the Holy Ghost, with the intention of doing what the Church doth, is not true baptism: let him be anathema.
CANON V.—If any one saith, that baptism is free, that is, not necessary unto salvation: let him be anathema.
CANON VI.—If any one saith, that one who has been baptized can not, even if he would, lose grace, let him sin ever so much, unless he will not believe: let him be anathema.