Charles H. Spurgeon on Psalms 104:31

The glory of the LORD shall endure forever. His works may pass away, but not his glory. Were it only for what he has already done, the Lord deserves to be praised without ceasing. His personal being and character ensure that he would be glorious even were all the creatures dead. The LORD shall rejoice in his works. He did so at the first, when he rested on the seventh day, and saw that everything was very good; he does so still in a measure where beauty and purity in nature still survive the Fall, and he will do so yet more fully when the earth is renovated, and the trail of the serpent is cleansed from the globe. This verse is written in the most glowing manner. The poet finds his heart gladdened by beholding the works of the Lord, and he feels that the Creator himself must have felt unspeakable delight in exercising so much wisdom, goodness, and power.