We shall also see with feelings of pleasure, the crimes and torments of the damned, in which the sanctity of the good, and the justice of God will wonderfully shine forth; for then the just will wash their hands in the blood of the wicked, as the prophet saith. And what doth "washing their hands in the blood of the wicked" signify, but that the good works of the blessed will shine more brightly, in comparison with the works of the wicked? The virginity of some will be more resplendent, when compared with the adulteries of others: and the fasts and alms-deeds of many, when compared with the gluttony and revellings of others. It will then be said: this young man was beautiful, and yet he observed perpetual chastity: this other youth was beautiful also, but not content with his own wife, he often committed adulteries and sacrileges. This man was rich and of noble extraction, and yet he fasted and prayed often, and gave abundant alms: another was equally rich and of noble extraction, but being addicted to gluttony and drunkenness, he spent his money in pleasures, so that he had nothing to give to the poor. Hence it will be, that the joy of the Just will be increased, by knowing the crimes of the wicked. At the same time, their joy will also be great, from the contemplation of the justice which will be so conspicuous, in the rewards of the blessed and the punishment of the wicked.
--St. Robert Bellarmine, The Eternal Happiness of the Saints