Dealing with the sacrifice once offered by Christ, he describes the Mass as the Sacrifice of the Church and the Eucharist as a Sacrament. His contention was that there is a unity between Christ's sacrifice begun at the Last Supper, consummated on the Cross and Resurrection and continued in the Mass.
In this context, he highlights the connection between Christ's sacrifice and the Mass, which began with the Last Supper, reached its peak on the Cross and Resurrection, and is maintained through the celebration of the Eucharist.