Charles H. Spurgeon on Psalms 21:4

"He asked life of thee, and thou gavest it him, even length of days for ever and ever." The glory of God is concerned in Christ's living for ever —1. The glory of his faithfulness: for eternal life and blessedness were pledged to Immanuel in covenant as the reward of his work (Psalm 110:1-4; Isaiah 9:6, 7, etc.); and it was in the anticipation and confident hope of this, that he "endured the cross, despising the shame." Hebrews 12:2; Psalm 16:8-11. 2. The glory of his justice. The justice of God was honoured and fully satisfied in all its righteous demands by the death of Christ. His subsequent life is the expression on the part of God of that satisfaction. His perpetual life is a permanent declaration that in him and his finished work the everlasting righteousness of Jehovah rests for ever satisfied. Death can "never more have dominion over him:" for to inflict the penalty again would be a violation of justice. 3. The glory of his grace. The glory of this grace he now lives actively to promote. John 17:2. By living "ever" at God's right hand, he appears as an eternal memorial of God's love in making him our Mediator and Substitute —our Saviour from sin and wrath; and his permanent appearance there will keep all heaven perpetually in mind that "by the grace of God they are what they are," owing all to the sovereign mercy of God through Jesus Christ. He shall appear as the blessed medium through which all the gifts and joys of salvation shall flow to the guilty for evermore. Thus the power of God and all his moral attributes secure the perpetuity of the life of the risen and exalted Saviour. —Ralph Wardlaw, D.D.