II. God's just judgment against sin is denounced that we may avoid it by deeds of mercy and love
On account therefore, dearly-beloved, of these crafty designs of our ancient foe, the unspeakable goodness of Christ has wished us to know, what was to be decreed about all mankind in the day of retribution, that, while in this life healing remedies are legitimately offered, while restoration is not denied to the contrite, and those who have been long barren can at length be fruitful, the verdict on which justice has determined may be fore-stalled and the picture of God's coming to judge the world never depart from the mind's eye.
For the Lord will come in His glorious Majesty, as He Himself has foretold, and there will be with Him an innumerable host of angel-legions radiant in their splendour. Before the throne of His power will all the nations of the world be gathered; and all the men that in all ages and on all the face of the earth have been born, shall stand in the Judge's sight. Then shall be separated the just from the unjust, the guiltless from the guilty; and when the sons of piety, their works of mercy reviewed, have received the Kingdom prepared for them, the unjust shall be upbraided for their utter barrenness, and those on the left having naught in common with those on the right, shall by the condemnation of the Almighty Judge be cast into the fire prepared for the torture of the devil and his angels, with him to share the punishment, whose will they choose to do.
Who then would not tremble at this doom of eternal torment? Who would not dread evils which are never to be ended? But since this severity is only denounced in order that we may seek for mercy, we too in this present life must show such open-handed mercy that after perilous neglect returning to works of piety it may be possible for us to be set free from this doom. For this is the purpose of the Judge's might and of the Saviour's graciousness, that the unrighteous may forsake his ways and the sinner give up his wicked habits.
Let those who wish Christ to spare them, have mercy on the poor; let them give freely to feed the wretched, who desire to attain to the society of the blessed. Let no man consider his fellow vile, nor despise in any one that nature which the Creator of the world made His own. For who that labours can deny that Christ claims that labour as done unto Himself? Your fellow-slave is helped thereby, but it is the Lord who will repay. The feeding of the needy is the purchase money of the heavenly kingdom and the free dispenser of things temporal is made the heir of things eternal.
But how has such small expenditure deserved to be valued so highly except because our works are weighed in the balance of love, and when a man loves what God loves, he is deservedly raised into His kingdom, whose attribute of love has in part become his?
Source: Sermons (New Advent)