After preaching the blessings of poverty, the Lord went on to say: Blessed are they who mourn, for they shall be comforted. But the mourning for which he promises eternal consolation, dearly beloved, has nothing to do with the ordinary worldly distress; for the tears which have their origin in the sorrow common to all mankind do not make anyone blessed. There is another cause for the saints, another reason for their blessed tears. Religious grief mourns for sin, one’s own or another’s; it does not lament because of what happens as a result of God’s justice, but because of what is done by human malice. Indeed, he who does wrong is more to be lamented than he who suffers it, for his wickedness plunges the sinner into punishment, whereas endurance can raise the just man to glory.
From a sermon on the beatitudes by Saint Leo the Great, pope