Pope Paul III, The Council of Trent, Can. 2 on the Sacrament of
Baptism, Sess. 7, 1547, ex cathedra: “If anyone shall say that real and natural water is not necessary for baptism, and on that account those words of Our Lord Jesus Christ: ‘Unless a
man be born again of water and the Holy Spirit’ [John 3:5],
are distorted into some sort of metaphor: let him be
If you say that real and natural water are not necessary for Baptism, i.e. that baptism can be attained through an implicit or explicit desire, you are an anathema. The dogma is not a metaphor; every human, excepting the Virgin Mary of course, has to be Baptized using the proper matter (real and natural water) and form in order to have original sin remitted.
Pope Paul III, The Council of Trent, Can. 5 on the Sacrament of
Baptism, Sess. 7, 1547, ex cathedra: “***If anyone says that baptism [the sacrament] is optional, that is, not necessary for salvation (cf. Jn. 3:5): let him be anathema.***”
Again it is very necessary to be water baptized.
Pope Paul III, The Council of Trent, On Original Sin, Session V, ex cathedra: "By one man sin entered into the world, and by sin death, and so death passed upon all men in whom all have sinned, is not to be understood otherwise than as the Catholic Church spread everywhere hath always understood it. For, by reason of this rule of faith, from a tradition of the apostles, even infants, who could not as yet commit any sin of themselves, are for this cause truly baptized for the remission of sins, that in them that may be cleansed away by regeneration, which they have contracted by generation. ***For, unless a man be born again of water and the Holy Ghost, he cannot enter into the kingdom of God. ***
If Baptism is absolutely necessary for infants who haven’t even sinned yet, how much is it necessary for adults who have a multitude of sins.