What is Baptism?
It is the first and most necessary Sacrament of the new Law, by which we are enrolled among the heirs of eternal life, because once it is conferred in water, by which we are spiritually reborn, and gain a full remission of sins, we are adopted into the sons of God.
[St. Peter Canisius, A Small Catechism for Catholics, Grant, tr. Mediatrix Press (2014) p. 58.]
