Charles H. Spurgeon on Psalms 104:34

I will be glad in the Lord. Compare this with verse 31, and observe the mutual and reciprocal pleasure and delight between God who is praised and the soul that praises him. God, who rejoices in his works, takes the highest delight in man, the compendium of his other works, and in that work, than which none more excellent can be pursued by man, the work of praising God in which the blessed are employed. Thus in this very praise of God which is so pleasing to him, David professes to be evermore willing to take delight. My beloved is mine, sings the Spouse, and I am his. Lorinus.