Psalms 13:6 - Albert Barnes' Notes on the Bible

I will sing unto the Lord, because he hath dealt bountifully with me - The word which is here rendered “dealt bountifully” - גמל gâmal - means properly “to deal” with anyone; to “treat” anyone well or ill; and then, to requite, or recompense. When used absolutely, as it is here, it is commonly employed in a good sense, meaning to deal favorably, or kindly, toward anyone; to treat anyone with favor. It means here that God had shown him kindness or favor, and had thus laid the foundation for gratitude and praise. The psalm closes, therefore, with expressions of joy, thankfulness, triumph. Though it begins with depression and sadness, it ends with joy. This is often observable in the Psalms. In the commencement it often occurs that the mind is overwhelmed with sorrow, and there is earnest pleading with God. Light, under the influence of prayer, breaks in gradually upon the soul. The clouds disperse; the darkness disappears. New views of the goodness and mercy of God are imparted; an assurance of his favor is brought to the soul; confidence in his mercy springs up in the heart; and the psalm that began with sorrowful complaining ends with the language of praise and of joy. So, too, it is in our own experience. Afflicted, depressed, and sad, we go to God. Everything seems dark. We have no peace - no clear and cheerful views - no joy. As we wait upon God, new views of his character, his mercy, his love, break upon the mind. The clouds open. Light beams upon us. Our souls take hold of the promises of God, and we, who went to His throne sad and desponding, rise from our devotions filled with praise and joy, submissive to the trials which made us so sad, and rejoicing in the belief that all things will work together for our good.