Of a particular trial John Newton wrote:
… he it is that hath laid this trial on me for my good. I believe it to be necessary, because he is pleased to appoint it; and, though at present it is not joyous, but grievous, I trust that in the end he will cause it to yield the peaceable fruits of righteousness. I desire to submit to his will in all things; and though I feel the depravity of my nature too often, yet, upon the whole, he enables me to trust to him, and leave all in his hands.
Andrew Groves 