Adam Clarke on Psalms 56:13

Thou hast delivered my soul from death - My life from the grave, and my soul from endless perdition.

My feet from falling - Thou hast preserved me from taking any false way, and keepest me steady in my godly course; and so supportest me that I may continue to walk before thee in the light of the living, ever avoiding that which is evil, and moving towards that which is good; letting my light shine before men, that they may see my good works, and glorify my Father which is in heaven. To walk before God is to please him; the light of the living signifies the whole course of human life, with all its comforts and advantages.