Summa Theologiae by St. Thomas Aquinas
XP: Treatise On Contrition
Q[23] Of Communication With Excommunicated Persons
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Prologue   A[1]   A[2]   A[3]  

We must now consider communication with those who are excommunicated. Under this head there are three points of inquiry:

A[1] Whether it is lawful to communicate in matters purely corporal with one who is excommunicated?

A[2] Whether one who communicates with an excommunicated person is excommunicated?

A[3] Whether it is always a mortal sin to communicate with an excommunicated person in matters not permitted by law?