Newton on Joy

I decided to take as my new year text today those familiar words of Habakkuk 3:17, 18. Reading the new Banner collection of Newton's letters to Ryland today (Wise Counsel) I came across a passage (from a letter published long before in the Works) that chimed in well. Newton writes

The great question is, how are we practically influenced by the word of God as the ground of our hope, and as the governing rule of our tempers and conversation? The apostle exhorts believers to rejoice in the Lord always. He well knew that they were exposed to trials and temptations, and to much trouble, from an evil heart of unbelief; and he prevents the objections we might be ready to make, by adding, "And again, I say, Rejoice!" As if he had said, I speak upon mature consideration; I call upon you to rejoice, not at some times only, but at all times; not only when upon the mount, but when in the valley; not only when you conquer, but while you are fighting; not only when the Lord shines upon you, but when he seems to hide his face.