John Calvin Commentary Psalms 34:1

"I will bless Jehovah at all times: His praise shall continually be in my mouth." — Psalms 34:1 (ASV)

I will bless Jehovah at all times. David here extols the greatness of God, promising to keep in remembrance during his whole life the goodness that He had bestowed upon him. God assists His people daily, so that they may continually engage in praising Him; yet it is certain that the blessing that is said to be worthy of everlasting remembrance is distinguished by this mark from other benefits that are ordinary and common.

This, therefore, is a rule that the saints should observe — they should often recall whatever good God has bestowed upon them; but if at any time He should display His power more illustriously in preserving them from some danger, so much the more does it become them earnestly to testify their gratitude.

Now if by one benefit alone God lays us under obligation to Himself all our life, so that we may never lawfully cease from proclaiming His praises, how much more when He heaps upon us innumerable benefits? In order to distinguish the praise that he had before said would be continually in his mouth from the empty sound of the tongue, in which many hypocrites boast, he adds, in the beginning of the second verse, that it would proceed from the heart.