Why does it say in the Mass, “. . . that we may merit to be coheirs to eternal life”?
During the intercession section of Eucharistic Prayer II, we pray these words:
Remember also our brothers and sisters who have fallen asleep in the hope of the Resurrection and all who have died in your mercy: welcome them into the light of your face. Have mercy on us all, we pray, that with the blessed Virgin Mary, Mother of God, with the blessed apostles, and all the saints who have pleased you throughout the ages, we may merit to be co-heirs to eternal life, and may praise and glorify you through your Son, Jesus Christ.
At this point, in offering the one sacrifice of Jesus Christ, we simply pray for us in the Church here on Earth, that we might, with God’s grace, persevere unto eternal salvation (CCC 1364-67, 1371).