Charles H. Spurgeon on Psalms 23:4

"Though I walk through the valley of the shadow of death." Any darkness is evil, but darkness and the shadow of death is the utmost of evils. David put the worst of his case and the best of his faith when he said, "Though I walk in the valley of the shadow of death, I will fear no evil;" that is, in the greatest evil I will fear no evil. . . . Again, to be under the shadow of a thing, is to be under the power of a thing. . . . Thus to be under the shadow of death, is to be so under the power or reach of death, that death may take a man and seize upon him when it pleaseth. "Though I walk in the valley of the shadow of death," that is, though I be so near death, that it seems to others death may catch me every moment, though I be under so many appearances and probabilities of extreme danger, that there appears an impossibility, in sense, to escape death, "yet I will not fear." Joseph Caryl.