John Newton, in a letter dated July 26, 1776 and published in The Christian Correspondent (1790), pages 131–132:
How fast the weeks return—we are again upon the eve of a Sabbath. May the Lord give us much of his own Spirit on his own day. I trust I have a remembrance in your prayers. I need them much—my service is great.
It is, indeed, no small thing to stand between God and the people—to divide the word of truth aright—to give every one portion—to withstand the counter tides of opposition and popularity—and to press those truths upon others, the power of which, I, at times, feel so little of in my own soul. A cold, corrupt heart is uncomfortable company in the pulpit.
Yet in the midst of all my fears and unworthiness, I am enabled to cleave to the promise, and to rely on the power of the Great Redeemer. I know I am engaged in the cause against which the gates of Hell cannot prevail. If He died and rose again, if He ever lives to make intercession—there must be safety under the shadow of his wings: there would I lie. In his name I would lift up my banner, in his strength I would go forth, do what he enables me, then take shame to myself that I can do no better, and put my hand upon my mouth, confessing that I am dust and ashes, less than the least of all his mercies.