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Ex Opere Operato

1910 New Catholic Dictionary

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A technical phrase used by theologians since the 13th century to signify that the sacraments produce grace of themselves, apart and distinct from the grace dependent upon the intention of the person conferring the sacrament; the latter effect is designated by the phrase ex opere operantis. The phrase is first found in the writings of Peter of Poitiers (c.1130-1215),

"The act of Baptism is not identical with Baptism because it is an opus operans while Baptism is an opus operatum."