Whether the Church should excommunicate anyone?

According to St. Thomas Aquinas:

"The Apostle (1 Corinthians 5:5) ordered a man to be excommunicated.

Further, it is written (Matthew 18:17) about the man who refuses to hear the Church:: "Let him be to thee as the heathen or publican." But heathens are outside the Church. Therefore they also who refuse to hear the Church, should be banished from the Church by excommunication.

I answer that, The judgment of the Church should be conformed to the judgment of God. Now God punishes the sinner in many ways, in order to draw him to good, either by chastising him with stripes, or by leaving him to himself so that being deprived of those helps whereby he was kept out of evil, he may acknowledge his weakness, and humbly return to God Whom he had abandoned in his pride. In both these respects the Church by passing sentence of excommunication imitates the judgment of God. For by severing a man from the communion of the faithful that he may blush with shame, she imitates the judgment whereby God chastises man with stripes; and by depriving him of prayers and other spiritual things, she imitates the judgment of God in leaving man to himself, in order that by humility he may learn to know himself and return to God." (Summa Theologica, suppl., q. 21,. a. 2).

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God bless,

Dave