Council of Trent: Session XXIII, Holy Orders, Chapter III

CHAPTER III. That Order is truly and properly a Sacrament.

Whereas, by the testimony of Scripture, by Apostolic tradition, and the unanimous consent of the Fathers, it is clear that grace is conferred by sacred ordination, which is performed by words and outward signs, no one ought to doubt that Order is truly and properly one of the seven sacraments of holy Church. For the apostle says; I admonish thee that thou stir up the grace of God, which is in thee by the imposition of my hands. For God has not given us the spirit of fear, but of power and of love of sobriety.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).