11 To give an example of what We are talking about, it is not permissible to extol the so-called "community" Mass in such a way as to detract from Masses that are celebrated privately; or to concentrate on the notion of sacramental sign as if the symbolism—which no one will deny is certainly present in the Most Blessed Eucharist—fully expressed and exhausted the manner of Christ's presence in this Sacrament; or to discuss the mystery of transubstantiation without mentioning what the Council of Trent had to say about the marvelous conversion of the whole substance of the bread into the Body and the whole substance of the wine into the Blood of Christ, as if they involve nothing more than "transignification," or "transfinalization" as they call it; or, finally, to propose and act upon the opinion that Christ Our Lord is no longer present in the consecrated Hosts that remain after the celebration of the sacrifice of the Mass has been completed.
Source: Mysterium Fidei (Vatican.va)