Whether Baptism may be reiterated?

❌ Objection 1 : It seems that Baptism may be reiterated. For Baptism was instituted, seemingly, in order to wash away sins. But sins are reiterated. Therefore much more should Baptism be reiterated: because Christ's mercy surpasses man's guilt.

❌ Objection 2 : Further, John the Baptist received special commendation from Christ, Who said of him (Mt. 11:11): "There hath not risen among them that are born of women, a greater than John the Baptist." But those whom John had baptized were baptized again, according to Acts 19:1-7, where it is stated that Paul rebaptized those who had received the Baptism of John. Much more, therefore, should those be rebaptized, who have been baptized by heretics or sinners.

❌ Objection 3 : Further, it was decreed in the Council of Nicaea (Can. xix) that if "any of the Paulianists or Cataphrygians should be converted to the Catholic Church, they were to be baptized": and this seemingly should be said in regard to other heretics. Therefore those whom the heretics have baptized, should be baptized again.

❌ Objection 4 : Further, Baptism is necessary for salvation. But sometimes there is a doubt about the baptism of those who really have been baptized. Therefore it seems that they should be baptized again.

❌ Objection 5 : Further, the Eucharist is a more perfect sacrament than Baptism, as stated above (Question [65], Article [3]). But the sacrament of the Eucharist is reiterated. Much more reason, therefore, is there for Baptism to be reiterated.