Roman Catechism 18.64

Chapter 18 — Part II: The Sacraments — The Holy Eucharist

Section 64. With reason, therefore, were the words for all not used, as in this place the fruits of the Passion are alone spoken of, and to the elect only did His Passion bring the fruit of salvation. And this is the purport of the Apostle when he says: Christ was offered once to exhaust the sins of many; and also of the words of our Lord in John: I pray for them; I pray not for the world, but for them whom thou hast given me, because they are thine.