Kommentar zu Mischlej 21:15

It is a joy for a righteous man to do judgment It is a joy for the Holy One, blessed be He, to inflict judgment upon the righteous in order to bestow upon them the life of the world to come, for the Holy One, blessed be He, brings pains upon them in order that they merit the world to come. In this manner, it is expounded in Midrash Psalms (3:1).

and a ruin It is [a ruin] for those who commit violence Because they do not put their hearts to repent and the pains do not avail them, but they suffer to no avail.