18 "There is no more an oblation for sin"... Where there is a full remission of sins, as in baptism, there is no more occasion for a sin offering to be made for such sins already remitted; and as for sins committed afterwards, they can only be remitted in virtue of the one oblation of Christ's death.
You probably object to the theology of the Eucharist as sacrifice; however, the Eucharist is not making a new sacrifice.
The Douay-Rheims is such a beautiful, poetic—almost musical—translation.