FR. A. TANQUERY, Dogmatic Brevior; ART. IV, Section I, II - 1945 (1024-1)
The Baptism of Desire. Contrition, or perfect charity, with at least an implicit desire for Baptism, supplies in adults the place of the baptism of water as respects the forgiveness of sins.
This is certain.
Explanation: a) An implicit desire for Baptism, that is, one that is included in a general purpose of keeping all the commandments of God is, as all agree, sufficient in one who is invincibly ignorant of the law of Baptism; likewise, according to the more common opinion, in one who knows the necessity of Baptism.
b) Perfect charity, with a desire for Baptism, forgives original sin and actual sins, and therefore infuses sanctifying grace; but it does not imprint the Baptismal character and does not of itself remit the whole temporal punishment due for sin; whence, when the Unity offers, the obligation remains on one who was sanctified in this manner of receiving the Baptism of water.