Yet the Lord will command his lovingkindness in the day time, and in the night his song shall be with me, and my prayer unto the God of my life. (Psalm 42:8)
In the midst of his near despondency, David sees a gleam of hope. God will command His love to become effective. As God controls the mighty torrents of nature, so He will control the waters of affliction and help His servant to survive them.