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What is to prevent the Pope from lifting the Anathemas of the Council of Trent and then canonizing Martin Luther? Already, Catholic Bishops, Cardinals, and even the Pope have been having ecuмenical services with the Lutherans. Have the anathemas of the Council of Trent been secretly lifted?
Well, informally, they have been declared not to apply to modern day Lutherans in the Joint Declaration from some years ago.
However, contrary to the Excommunication of 1054, which was directed specifically at the Patriarch/church of Constantinopolis, the Anathemas of Trent are generic, ipso facto excommunications applied and applicable to anyone who contradicts the Divine Truths expressed in the Council text itself.
In fact, I would argue, they are not revokable, and were in effect even before the Council, as they simply condemn heretical positions, which themselves were already so, and always will.
From that point of view, the Council of Trent simply
declared infallibly those condemnations, in the sense of making them known, public and notorious, but the efficacy stems directly from Divine Law.
So, if anyone were to attempt to simply denounce them as invalid, it would equate to endorsing the heresies themselves, and he himself would be under anathema with all that entails.
In fact, it is often argued the two unPopes responsible for the Declaration, and everyone involved, did already.