If you make at least a quick survey of the Psalms—and I confess I’ve only done it quickly, you’ll notice a very remarkable thing which is actually perfectly in keeping with the principial teaching of the NT, and that is this: only about a third of the Psalter is addressed to God; another third of the Psalter is addressed to me; and another third of the Psalter is addressed to you. Now isn’t that interesting? Here in the midst often of rather foolish language that has not been tested by Scripture, we are sometimes urged to sing only those things that are directed towards God; and we cannot do that without saying that the Lord Jesus was singing some of the wrong things!
So we need to be very careful, for example, about some of us—you know we all belong to different ends and edges of the spectrum on this—some of us who rather despise songs that have a focus on myself. What is the key thing here? The key thing here is not the question of how many times the first person singular is mentioned, but where those many mentions of the first person singular are eventually going to lead. Are they going to lead me from the first person singular to the three Persons divine? Is it not legitimate for me to sing, “Why are you cast down, O my soul?” so long as I am going to sing, “Hope thou in God, send your light forth and your truth, and let them be guides to me”?
—Sinclair Ferguson, “True Spirituality, True Worship” (audio message)