Roman Catechism 17.34

Chapter 17 — Part II: The Sacraments — Confirmation

Section 34. The pastor should take care that they have previous recourse to confession of their sins; should exhort them to fasting and other works of piety; and admonish them of the propriety of reviving that laudable practice of the ancient Church, of receiving this Sacrament fasting. It is to be presumed that to this the faithful may be easily persuaded, if they but understand the gifts and admirable effects of this Sacrament.