"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 LiguoriMany, however, gives themselves to God, but preserve still in their hearts some attachment to creatures, which prevents them from belonging entirely to God.
Alphonsus LiguoriLet us remember the devil labors hard to disturb us at the time of recollection in order to make us abandon it. Let him then who omits mental prayer on account of distractions be persuaded that he gives delight to the devil.
Alphonsus LiguoriDevil does not bring sinners to Hell with their eyes open: he first blinds them with the malice of their own sins. He thus leads them to eternal perdition. Before we fall into sin, the enemy labours to blind us, that we may not see the evil we do, and the ruin we bring upon ourselves by offending God. After we commit sin, he seeks to make us dumb, that, through shame, we may conceal our guilt in confession.
Alphonsus Liguori