If a person remains weak in the faith, his faith will finally be overcome and extinguished. Therefore, if he is to remain a Christian, his faith must grow and become firmer. His faith must be built on the Word alone so that he can comfort himself with that mere written Word even when he feels no joy in his heart. Then he will believe in the forgiveness of his sins even when he senses the presence of sin still dwelling in him.—C. F. W. Walther, God Grant It!, p. 746, 7.