J. Gresham Machen, one of the great proclaimers and defenders of the Christian faith in the early 20th century, went through a season of fearful doubt on his way to solid confidence. Remarkably, it was his mother who spoke one of the decisive words of rescue. He tells the story:

The question is not merely whether we can rest in our faith, but whether we can rest in the doubt that is the necessary alternative of faith. We pass sometimes through periods of very low spiritual vitality. The wonderful gospel which formerly seemed to be so glorious comes to seem almost like an idle tale. Hosts of objections arise in our minds; the whole unseen world recedes in the dim distance, and we think for the moment that we have relinquished the Christian hope....

My mother [spoke to me] in those dark hours when the lamp burned dim, when I thought that faith was gone and shipwreck had been made of my soul. “Christ,” she used to say, “keeps firmer hold on us than we keep on him.”

My mother’s word meant...that salvation by faith does not mean that we are saved because we keep ourselves at every moment in an ideally perfect attitude of confidence in Christ. No, we are saved because having once been united to Christ by faith, we are his forever. Calvinism is a very comforting doctrine indeed. Without its comfort, I think I should have perished long ago in the castle of Giant Despair. (J. Gresham Machen: Selected Shorter Writings, 561)