This great miracle of love, which the priest is called ever more faithfully to witness and proclaim (cf. Apostolic Letter Mane Nobiscum Domine, n. 30), is renewed in his hands. This is the reason why the priest must be first and foremost an adorer who contemplates the Eucharist, starting from the very moment in which he celebrates it. We are well aware that the validity of the Sacrament does not depend on the holiness of the celebrant, but its effectiveness for him and for others will be all the greater the deeper the faith, the more ardent the love and the more fervent the spirit of prayer with which he lives it.
Pope Benedict XVI, ANGELUS, September 18, 2005