This psalm opens with a stanza about how the heavens — the sun, stars, and so forth — act as witnesses of God and His glory. And there is something about looking up at the skies that inspires wonder and awe; something about how innumerable the stars are that invites us to consider Who created those stars. And, in his boyhood shepherding duties, David would have had ample opportunity to lie under those stars and consider his Creator.
David then looks down at The Word of God. If the sun and stars and heavens generally speak of God and His glory, how much more does His Word. How much more clear God’s Word is about the character of its Author and what He requires of us. While the heavens invite us to ponder Him, His Word bids us know Him. And it is ultimately by God’s Word that we are instructed and given guidance regarding what God requires of us.
With such a pairing of witnesses — the heavens and God’s Word — David ends with the request that the words of his mouth and the meditations of his heart would be acceptable in God’s sight. And that is what this psalm invites me to ask of God. If the heavens generally speak of God and His Word speaks more specifically, then I, as His child, ought to be the most specific testimony of God available. My words should be reflective of His Word. And the things I habitually think about ought to be like the heavens, inviting others to be awed and amazed by my Creator and theirs.
Father, let me join with David his morning and pray simply, let the word of my mouth and the meditations of my heart be acceptable in Thy sight, oh LORD, my Rock and my Redeemer.