Catholic Dictionary

Term

EX OPERE OPERANTIS

Definition

A term mainly applied to the good dispositions with which a sacrament is received, to distinguish it from the ex opere operato, which is the built-in efficacy of a sacrament properly conferred. But it may refer to any subjective factor that at least partially determines the amount of grace obtained by a person who performs some act of piety. Thus in the use of sacramentals or in the gaining of indulgences, the blessings received depend largely on the faith and love of God with which a sacramental is employed or an indulgenced prayer or good work is performed.