Matthew Poole and continuators on Psalms 104:31

31 The glory of the LORD shall endure for ever: the LORD shall rejoyce in his works .

So the sence is, Thus God doth and will advance the glory of his wisdom and power and goodness in upholding and continuing the works of his hands from generation to generation, and he doth and will take pleasure both in the preservation and blessing of his works, as also in his reflection upon these works of his Providence, as he did rest and delight himself in the contemplation of his works of Creation, as is noted, Gen. 1. 31. & 2. 2, 3. But the words are by divers, and, as it may seem, more agreeably to the Hebrew Text, rendred thus, Let (for the first word is of the Imperative Mood) the glory of the Lord endure for ever, and let the Lord have joy (Or, then shall the Lord rejoyce) in his works. So this is added as a convenient Doxology or Thanksgiving after the Commemoration of his great and gracious works: and the sence may be this, Seeing therefore God hath enriched the Earth and us with so many fruits of his bounty, let it be our constant desire and endeavour, that God may be perpetually served and glorified in and by them, and that God may be no more grieved at the remembrance of his kindness to us, as he was, Gen. 6. 5, 6. and thereby be again provoked to destroy us, but may take pleasure in beholding and cherishing of his own workmanship.

Marginal references: Heb. shall be.