There are serious problems in the Roman Church. The symptoms include a decline in participation in the Mass, a shortage of priests, a loss of authority of the Church. Appropriate changes are necessary in the life of the Church. For these to be successful tradition alone is an insufficient guide. Based on the encyclical Ecclesia de Eucharistia, this work returns as closely as possible to the understanding of the words of Jesus, "this is my body", when they were first heard. Thus it can is shown ...