Summa contra Gentiles3.145 Chapter CXLV. That sins are punished also by the sinner being subjected to some kind of pain

Those who sin against God are to be punished not only by forfeiting beatitude for ever, but also by being subjected to some kind of pain. For punishment should be proportionate to fault, as we proved above. Now when a man sins, his mind not only turns away from his last end, but also turns unduly to other things as ends. Therefore the sinner should be punished not only by being debarred from his end, but also by experiencing hurt from other things.

Again. Punishments are inflicted for sins that, through fear of being punished, men may be withdrawn from sin, as stated above. Now no one fears to lose what he desires not to get. Consequently, those whose will is turned away from their last end,. ear not to lose it. Hence they would not be recalled from sinning by the mere loss of their last end. Therefore some other punishment, which sinners would fear, should be inflicted on them.

Also. If a man abuses the means to an end, not only is he debarred from the end, but he incurs some other hurt besides: for instance, food taken injudiciously, not only does not strengthen, but even causes sickness. Now the man who places his end in creatures, does not use them as he should, namely by referring them to his last end. Therefore he should be punished, not only by forfeiting beatitude, but also by undergoing some hurt from them.

Besides. As good things are due to well-doers, so evil things are due to evil-doers. Now those who do aright, reap perfection and joy in the end intended by them. Therefore, on the other hand, such a punishment is due to sinners, that they reap pain and hurt from the things wherein they place their end.

Hence it is that Holy Writ threatens sinners not only with exclusion from glory, but also with affliction from other things. For it is said (Matth. xxv. 41): Depart from me, you cursed, into everlasting fire which was prepared for the devil and his angels: and (Ps. x. 7): He shall rain snares upon sinners; fire, and brimstone, and storms of winds shall be the portion of their cup.

Hereby we refute the opinion of Algazel, who said that the only punishment meted to sinners is their loss of their last end.