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And, in like manner, a Mahometan may be so deeply convinced that Mahomet is the prophet of God, that it would be only by a quibble about the meaning of the word “certitude” that we could maintain, that, on his becoming a Catholic, he did not unequivocally prove that certitude is defectible.

Therefore to some effects He has attached necessary causes, that cannot fail; but to others defectible and contingent causes, from which arise contingent effects.

For God, the supremely good, is not the author of evils, but the rational and defectible will is the cause of sin; wherefore let no one impute his midsdeeds and crimes to God, but to himself, according to Jer.