Roman Catechism 16.122

Chapter 16 — Part II: The Sacraments — Baptism

Section 122. Effects Of Baptism Foreshadowed In The Baptism Of Christ — These effects which are wrought in us by virtue of Baptism are distinctly marked by the circumstances which, as the Gospel relates, accompanied the Baptism of our Saviour. The heavens were opened and the Holy Ghost appeared descending upon Christ our Lord in the form of a dove. By this we are given to understand that to those who are baptised are imparted the gifts of the Holy Spirit, that to them are opened the gates of heaven. The baptised, it is true, do not enter heaven immediately after Baptism, but in due season. When they shall have been freed from all misery which is incompatible with a state of bliss, they shall exchange a mortal for an immortal life.