a) Other points in its favor are the following: “Sufficient grace,” in the Congruist hypothesis, is truly sufficient so far as God is concerned, because its inefficaciousness is attributable solely to the human will. That free-will is properly safeguarded under the influence of efficacious grace (_gratia congrua_) is admitted even by theologians of the opposing schools. True, Congruism does not regard the will as an abstract notion, but as a factor closely interwoven with the concrete circumstances of daily life. As favorable circumstances (education, association, temperament) merely influence the will but do not compel it, so supernatural grace (_gratia congrua s. efficax_) may soften the will and occasionally even break down its resistance, but (rare cases excepted)(772) will never compel it to do good. Congruism marks a distinct advance over extreme Molinism also in this, that it bases the difference between _gratia efficax_ (_congrua_) and _gratia inefficax_ not entirely on the will of man, but likewise on the will of God, whereby it is able to explain such formulas as “_Deus facit, ut faciamus_,” “_Deus est, qui discernit_,” _etc._, in a manner entirely compatible with the dogmatic teaching of the Church.(773) The _modus operandi_ of the _gratia congrua_ (efficacious grace) is explained by Congruism, in common with Molinism, as follows: There is a threefold efficacy: the efficacy of power (_efficacia virtutis_), the efficacy of union (_efficacia connexionis_), and the efficacy of infallible success (_efficacia infallibilitatis_). Grace (both efficacious and sufficient) does not derive its _efficacia virtutis_ from the free-will of man, nor from the knowledge of God (_scientia media_), but from itself. The _efficacia connexionis_ (of union between act and grace) on the other hand, depends entirely on the free-will, since, according to the Council of Trent as well as that of the Vatican, efficacious grace does not operate irresistibly but can be “cast off.” The _efficacia infallibilitatis_ springs from God’s certain foreknowledge (_scientia media_), which cannot be deceived.(774)