Psalm 13:6 I will sing unto the Lord, because he hath dealt bountifully with me.
The Lord has dealt bountifully with David and saved him from enemies. Therefore he will sing unto the Lord. Saying Thank You and Praising God is the natural and proper response to God’s deliverance from the present trouble. But that feels a little inadequate, not enough. So he sings his thanks and praise, putting music to his Psalms of Thanksgiving.
God is good, God delivers, God deals bountifully with us. When we personally realize that truth we naturally respond with praise and song. Every time we hear the Gospel and the Holy Spirit applies it to our heart we are moved to sing. And that should happen at least once every day. We respond with “Psalms and hymns and spiritual songs, making melody in your heart to the Lord.” This kind of response becomes a constant way of life, singing and making melody all day long, for the Gospel is always true and God is always good. We thank God for freely granting eternal life and salvation when we die and through Christ overcome death. But we also praise Him for being here, with us, a very present help in time of need. We cannot help but burst into song in the heart at every remembrance of Grace. Even when we are not feeling good God is still good. Therefore, we can sing to Lord anyway, and what happens is that we start feeling better. Praise the Lord!