Psalms 50:6

"And the Heaven shall declare His righteousness" [Psalm 50:6]. Truly this righteousness of God to us the "heavens have declared," the Evangelists have foretold. Through them we have heard that some will be on the right hand, to whom the Householder says, "Come, you blessed of My Father, receive." [Matthew 25:34] Receive what? "A kingdom." In return for what thing? "I was an hungred, and you gave Me to eat." What so valueless, what so earthly, as to break bread to the hungry? At so much is valued the kingdom of heaven. "Break your bread to the hungry, and the needy without covering bring into your house; if you see one naked, clothe him." [Isaiah 58:7] If you have not the means of breaking bread, hast not house into which you may bring, hast not garment wherewith you may cover: give a cup of cold water, [Matthew 10:42] cast two mites into the treasury. [Mark 12:42] As much the widow does buy with two mites, as Peter buys, by leaving the nets, [Matthew 4:20] as Zacchæus buys by giving half his goods. [Luke 19:8] Of so much worth is all that you have. "The heavens shall declare His righteousness, for God is Judge." Truly judge not confounding but severing. For "the Lord knows them that are His." [2 Timothy 2:19] Even if grains lie hidden in the chaff, they are known to the husbandman. Let no one fear that he is a grain even among the chaff; the eyes of our winnower are not deceived. Fear not lest that tempest, which shall be round about Him, should confound you with chaff. Certainly mighty will be the tempest; yet not one grain will it sweep from the side of the grain to the chaff: because not any rustic with three-pronged fork, but God, Three in One, is Judge. And the heavens shall declare His righteousness: for God is Judge. […]

Declare - God will convince the people of his righteousness, and of their own wickedness, by thunders and lightnings, and storms, or other dreadful signs wrought by him in the heavens.

And the heavens shall declare his righteousness,....

And the heavens shall declare his righteousness. Celestial intelligences and the spirits of just men made perfect, shall magnify the infallible judgment of the divine tribunal. Now they doubtless wonder at the hypocrisy of men; then they shall equally marvel at the exactness of the severance between the true and the false. For God is judge himself. This is the reason for the correctness of the judgment. Priests of old, and churches of later times, were readily deceived, but not so the all discerning Lord.

And the heavens shall declare his righteousness. Celestial intelligences and the spirits of just men made perfect, shall magnify the infallible judgment of the divine tribunal. Now they doubtless wonder at the hypocrisy of men; then they shall equally marvel at the exactness of the severance between the true and the false. For God is judge himself. This is the reason for the correctness of the judgment. Priests of old, and churches of later times, were readily deceived, but not so the all discerning Lord. No deputy judge sits on the great white throne; the injured Lord of all himself weighs the evidence and allots the vengeance or reward. The scene in the Psalm is a grand poetical conception, but it is also an inspired prophecy of that day which shall burn as an oven, when the Lord shall discern between him that feareth and him that feareth him not. Selah. Here we may well pause in reverent prostration, in deep searching of heart, in humble prayer, and in awe struck expectation.