Charles H. Spurgeon on Psalms 104:31

The Lord shall rejoice in his works. Man alone amongst the creatures grieves God, and brought tears from the eyes of Christ, who rejoiced in Spirit, because the Father had deigned to reveal the mysteries to the little ones. It repented God that he had made men, because as a wise son maketh a glad father, so a foolish one is a vexation to him. Lorinus.

Verse 31 (last clause). What the Psalmist adds, Let Jehovah rejoice in his works, is not superfluous, for he desires that the order which God has established from the beginning may be continued in the lawful use of his gifts. As we read in Ge 6:6, that "it repented the Lord that he had made man on the earth; "so when he sees that the good things which he bestows are polluted by our corruptions, he ceases to take delight in bestowing them. And certainly the confusion and disorder which take place, when the elements cease to perform their office, testify that God, displeased and wearied out, is provoked to discontinue, and put a stop to the regular course of his beneficence; although anger and impatience have strictly speaking no place in his mind. What is here taught is, that he bears the character of the best of fathers, who takes pleasure in tenderly cherishing his children, and in bountifully nourishing them. John Calvin.