The sacraments are efficacious ex opere operato (“by the very fact that the sacramental action is performed”) because it is Christ who acts in the sacraments and communicates the grace they signify. The efficacy of the sacraments does not depend upon the personal holiness of the minister. However, the fruits of the sacraments do depend on the dispositions of the one who receives them.
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Paragraph 1127
1127. Celebrated worthily in faith, the sacraments confer the grace that they signify.48 They are efficacious because in them Christ himself is at work: it is he who baptizes, he who acts in his sacraments in order to communicate the grace that each sacrament signifies. the Father always hears the prayer of his Son's Church which, in the epiclesis of each sacrament, expresses her faith in the power of the Spirit. As fire transforms into itself everything it touches, so the Holy Spirit transforms into the divine life whatever is subjected to his power.
Paragraph 1128
1128. This is the meaning of the Church's affirmation49 that the sacraments act ex opere operato (literally: "by the very fact of the action's being performed"), i.e., by virtue of the saving work of Christ, accomplished once for all. It follows that "the sacrament is not wrought by the righteousness of either the celebrant or the recipient, but by the power of God."50 From the moment that a sacrament is celebrated in accordance with the intention of the Church, the power of Christ and his Spirit acts in and through it, independently of the personal holiness of the minister. Nevertheless, the fruits of the sacraments also depend on the disposition of the one who receives them.
Paragraph 1131
1131. The sacraments are efficacious signs of grace, instituted by Christ and entrusted to the Church, by which divine life is dispensed to us. the visible rites by which the sacraments are celebrated signify and make present the graces proper to each sacrament. They bear fruit in those who receive them with the required dispositions.
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