To restrain those who for the offense of one soul bind a transgressor's entire household, that is, a large number of souls, under one sentence of excommunication, and especially to prevent any one from departing this life unbaptized in consequence of such an anathema—also to decide the question whether persons ought not to be driven forth even from a church, who seek a refuge there in order that they may break the faith pledged to sureties, I desire with the Lord's help to use the necessary measures in our Council, and, if it be necessary, to write to the Apostolic See; that, by a unanimous authoritative decision of all, we may have the course which ought to be followed in these cases determined and established. One thing I say deliberately as an unquestionable truth, that if any believer has been wrongfully excommunicated, the sentence will do harm rather to him who pronounces it than to him who suffers this wrong. For it is by the Holy Spirit dwelling in holy persons that any one is loosed or bound, and He inflicts unmerited punishment upon no one; for by Him the love which works not evil is shed abroad in our hearts.]
Source: Letters (New Advent)