Praise for the past, trust for the future

I trust you find the name and grace of Jesus more and more precious to you; His promises more sweet, and your hope in them more abiding; your sense of your own weakness and unworthiness daily increasing; your persuasion of his all-sufficiency, to guide, support, and comfort you, more confirmed. You owe your growth in these respects in a great measure to His blessing upon those afflictions which He has prepared for you, and sanctified to you. May you praise Him for all that is past, and trust Him for all that is to come!

--from a letter John Newton wrote that has been titled "The School of Suffering" whole thing here

many other newton letters here