"It is a fearful thing to fall into the hands of the living God," says St. Paul (Heb. x. 31). If we now dread Hell, we shall not have any reason to fear or endure it in the next life.
Every one has sufficient grounds for dreading it. The just and holy should fear Hell, because they may yet fall into it. So long as they remain on earth, they are surrounded by not only exterior, but also interior, dangers. Outside of them there is the world with its allurements, its scandals and temptations, and human respect.
Within them dwell violent passions and a weak will. Only a single mortal sin suffices to cause their condemnation to the infernal abyss. How many are now in Hell, who for a time were remarkable for their piety and virtue, but who gradually grew careless in the service of God, and finally fell into mortal sin and died without having become reconciled with God. Even the great St. Teresa was in danger of damnation, for God showed her the place destined for her in Hell, if she did not give up certain faults.
The greatest Saints have shuddered and trembled at the thought of the danger they were in of committing mortal sin and of being condemned for it to the endless torments of Hell. St. Peter of Alcantara, who performed such great penances, dreaded even in his last moments the danger of falling into Hell. St. Augustine and St. Bernard were filled with terror at the very thought of Hell and of the danger they were in of deserving it.