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Searching the Patrologia Latina database, St. Ambrose seems to be the first Latin Father who uses the term, in his commentary on Psalm 118:153-160 (Hebrew letter "Resh", Χ¨), Sermon 20, PL 15 col. 1575:
- [β¦] Unde et Apostolus ait: Fugite fornicationem (I Cor. VI, 18). Nam qua causa fugeres, nisi illa te persequeretur? Est enim malus spiritus fornicationis, est malus spiritus avaritiΓ¦, malus spiritus superbiΓ¦.
Wherefore the Apostle also said: Flee fornication (1 Cor. 6:18). For what reason would you flee unless it pursued you? For there is an evil spirit of fornication, there is an evil spirit of covetousness, an evil spirit of pride.
- [β¦] Tentatus es spiritu fornicationis; sed veritus Christi futurum judicium, temerandam mentis et corporis castimoniam non putasti: martyr es Christi. [β¦]
You were tempted by the spirit of fornication; but, fearing the future judgment of Christ, did not consider the chastity of mind and body to be violated: you are a martyr of Christ.