Psalms 104:33

Man's glory is fading; God's glory is everlasting: creatures change, but with the Creator there is no variableness. And if mediation on the glories of creation be so sweet to the soul, what greater glory appears to the enlightened mind, when contemplating the great work of redemption! There alone can a sinner perceive ground of confidence and joy in God. While he with pleasure upholds all, governs all, and rejoices in all his works, let our souls, touched by his grace, meditate on and praise him.

I will sing unto the LORD as long as I live, or, literally, in my lives. Here and hereafter the psalmist would continue to praise the Lord, for the theme is an endless one, and remains for ever fresh and new. The birds sang God's praises before men were created, but redeemed men will sing his glories when the birds are no more. Jehovah, who ever lives and makes us to live shall be for ever exalted, and extolled in the songs of redeemed men. I will sing praise to my God while I have my being. A resolve both happy for himself and glorifying to the Lord. Note the sweet title —my God. We never sing so well as when we know that we have an interest in the good things of which we sing, and a relationship to the God whom we praise.