Charles H. Spurgeon on Psalms 102:27

But thou art the same, or, "thou art he." As a man remains the same when he has changed his clothing, so is the Lord evermore the unchanging One, though his works in creation may be changed, and the operations of his providence may vary. When heaven and earth shall flee away from the dread presence of the great Judge, he will be unaltered by the terrible confusion, and the world in conflagration will effect no change in him; even so, the Psalmist remembered that when Israel was vanquished, her capital destroyed, and her temple levelled with the ground, her God remained the same self-existent, all-sufficient being, and would restore his people, even as he will restore the heavens and the earth, bestowing at the same time a new glory never known before. The doctrine of the immutability of God should be more considered than it is, for the neglect of it tinges the theology of many religious teachers, and makes them utter many things of which they would have seen the absurdity long ago if they had remembered the divine declaration, "I am God, I change not, therefore ye sons of Jacob are not consumed." And thy years shall have no end. God lives on, no decay can happen to him, or destruction overtake him. What a joy is this! We may lose our dearest earthly friends, but not our heavenly Friend. Men's days are often suddenly cut short, and at the longest they are but few, but the years of the right hand of the Most High cannot be counted, for they have neither first nor last, beginning nor end. O my soul, rejoice thou in the Lord always, since he is always the same.