Thomas Aquinas

“ It is not praiseworthy in a wayfarer to rejoice in another's afflictions as such: yet it is praiseworthy if he rejoice in them as having something annexed. However it is not the same with a wayfarer as with a comprehensor, because in a wayfarer the passions often forestall the judgment of reason, and yet sometimes such passions are praiseworthy, as indicating the good disposition of the mind, as in the case of shame pity and repentance for evil: whereas in a comprehensor there can be no passion but such as follows the judgment of reason. ”

“ Further, perfection of vision depends on the perfection of the visible object: wherefore the Philosopher says (Ethic. x, 4) that "the most perfect operation of the sense of sight is when the sense is most disposed with reference to the most beautiful of the objects which fall under the sight." Therefore, on the other hand, any deformity in the visible object redounds to the imperfection of the sight. But there will be no imperfection in the blessed. Therefore they will not see the sufferings of the damned wherein there is extreme deformity. ”

“ But in the future state it will be impossible for them to be taken away from their unhappiness: and consequently it will not be possible to pity their sufferings according to right reason. Therefore the blessed in glory will have no pity on the damned.
Reply to Objection 1: Charity is the principle of pity when it is possible for us out of charity to wish the cessation of a person's unhappiness. But the saints cannot desire this for the damned, since it would be contrary to Divine justice. ”

“ Consequently it is possible to have compassion on them both by the choice of the will---in which sense God, the angels and the blessed are said to pity them by desiring their salvation---and by passion, in which way they are pitied by the good men who are in the state of wayfarers. ”

“ Thus a person sometimes rejoices in his own evil as when we rejoice in our own afflictions, as helping us to merit life: "My brethren, count it all joy when you shall fall into divers temptations" (James 1:2) . ”