Kinds of "Traffic" Catholic Priests are Forbidden to Engage in

According to Instruction VIII of St. Alphonsus Liguori's *Dignity and Duties of the Priest*: > In conformity with the words of the Apostle: *No man being a soldier to God entangleth himself with secular business, that he may please Him to Whom he hath engaged himself. (2 Tim. ii. 4.)* The holy Church prohibits, with so much rigor, and under pain of censure, ecclesiastics to engage in traffic. >The priest is consecrated to God; he therefore should attend to no other business than the advancement of God's glory. The Lord does not accept empty victims from which the marrow has been extracted. *I will offer up to Thee,* said David, *holocausts full of marrow. (Ps. lxv. 15.)* The sacrifices, the Masses, Offices, and works that a priest dissipated by the cares of traffic offers to God are, says St. Peter Damian, empty; for he has taken away the marrow, that is, attention and devotion, and presents only the skin or external appearance. I am assuming that the word "traffic" implies operating some kind of a business, but I don't know for sure. Does anyone know what exactly is meant by the word *traffic* here; and what kinds of traffic did the Catholic Church forbid priests from engaging in? Also, where may such declaration(s) be found? Was it declared in a papal encyclical or by a Council, or both?