That the saints may enjoy their beatitude and the grace of God more abundantly they are permitted to see the punishment of the damned in hell.
Thomas AquinasClearly the person who accepts the Church as an infallible guide will believe whatever the Church teaches.
Thomas AquinasThe magnitude of the punishment matches the magnitude of the sin. Now a sin that is against God is infinite; the higher the person against whom it is committed, the graver the sin-it is more criminal to strike a head of state than a private citizen-and God is of infinite greatness. Therefore an infinite punishment is deserved for a sin committed against Him.
Thomas Aquinas