Ps. xxiii. 4, 6, "Though I walk through the valley of the shadow of death, I will fear no evil: for thou art with me; thy rod and thy staff they comfort me. Surely goodness and mercy shall follow me all the days of my life: and I will dwell in the house of the Lord for ever." The psalmist expresseth an exceeding confidence in the midst of most inexpressible troubles and pressures. He supposes himself "walking through the valley of the shadow of death." As "death" is the worst of evils, and comprehensive of them all, so the "shadow" of death is the most dismal and dark representation of those evils to the soul, and the "valley" of that shadow the most dreadful bottom and depth of that representation.

~ John Owen