Let us read the lives of the saints; let us consider the penances which they performed, and blush to be so effeminate and so fearful of mortifying our flesh.
Alphonsus LiguoriSt. Augustine and St. Thomas define mortal sin to be a turning away from God: that is, the turning of one's back upon God, leaving the Creator for the sake of the creature. What punishment would that subject deserve who, while his king was giving him a command, contemptuously turned his back upon him to go and transgress his orders? This is what the sinner does; and this is punished in hell with the pain of loss, that is, the loss of God, a punishment richly deserved by him who in this life turns his back upon his sovereign good.
Alphonsus LiguoriSo great is the compassion excited in Mary by our misery, and such is the love that she bears us, that she prays constantly, and relaxes not her efforts in our behalf.
Alphonsus Liguori