To shine upon (epipanai). First aorist active infinitive of epipainw (liquid verb). An old verb to give light, to shine upon, like the sun or stars. See also Acts 27:20 ; Titus 2:11 ; Titus 3:4 . The shadow of death (skiai qanatou). See Psalms 107:10 , where darkness and shadow of death are combined as here. Cf. also Isaiah 9:1 . See on "Mt 4:16". To guide (tou kateuqnai). Genitive of the articular infinitive of purpose. The light will enable them in the dark to see how to walk in a straight path that leads to "the way of peace." We are still on that road, but so many stumble for lack of light, men and nations.