He would be guilty of mortal sin, because he exposes himself to the danger of grievously offending God. Hence, before he acts he must lay aside the doubt; and if he has not hitherto done so, he must confess it, at least, as it is before God. But the scrupulous, who have doubts about everything, must follow another rule: they must obey their confessor. When he tells them to conquer their doubts, and to act against scruples, they should obey with exactness; otherwise they will render themselves unable and unfit to perform any spiritual exercise.
Alphonsus LiguoriDo not allow your daughters to be taught letters by a man, though he be a St. Paul or St. Francis of Assissium. The saints are in Heaven.
Alphonsus Liguori"Happy he that knows Thee, even if he knows nothing else," says St. Augustine. If we knew all the sciences and knew not how to love Jesus Christ, our knowledge shall profit us nothing to eternal life. But if we know how to love Jesus Christ, we shall know all things, and shall be happy for eternity.
Alphonsus LiguoriCertainly amongst all devotions, after that of receiving the sacraments, that of adoring Jesus in the Blessed Sacrament holds first place, is most pleasing to God, and most useful to ourselves. Do not then, O devout soul, refuse to begin this devotion; and forsaking the conversation of men, dwell each day, from this time forward, for at least half or quarter of an hour, in some church, in the presence of Jesus Christ under the sacramental species. Taste and see how sweet is the Lord.
Alphonsus LiguoriA soul who loves Jesus Christ desires to be treated the way Christ was treated-desires to be poor, despised, and humiliated.
Alphonsus LiguoriNew revelations regarding faith or morals ... have always been abhorred and challenged in the Church ... Hence, the Sovereign Pontiffs, the Councils, and the Fathers have been most careful to reject all novelties or new doctrines on matters of faith which differed from those already received.
Alphonsus Liguori