Whether immersion in water is necessary for Baptism?

❌ Objection 1 : It seems that immersion in water is necessary for Baptism. Because it is written (Eph. 4:5): "One faith, one baptism." But in many parts of the world the ordinary way of baptizing is by immersion. Therefore it seems that there can be no Baptism without immersion.

❌ Objection 2 : Further, the Apostle says (Rm. 6:3,4): "All we who are baptized in Christ Jesus, are baptized in His death: for we are buried together with Him, by Baptism into death." But this is done by immersion: for Chrysostom says on Jn. 3:5: "Unless a man be born again of water and the Holy Ghost," etc.: "When we dip our heads under the water as in a kind of tomb, our old man is buried, and being submerged, is hidden below, and thence he rises again renewed." Therefore it seems that immersion is essential to Baptism.

❌ Objection 3 : Further, if Baptism is valid without total immersion of the body, it would follow that it would be equally sufficient to pour water over any part of the body. But this seems unreasonable; since original sin, to remedy which is the principal purpose of Baptism, is not in only one part of the body. Therefore it seems that immersion is necessary for Baptism, and that mere sprinkling is not enough.