Psalms 27:1

David expressed great confidence as he looked to the future because Yahweh was his light, salvation, and defense (stronghold). Light connotes understanding, joy, and life (cf. Psalms 18:28). According to Warren Wiersbe, this is the first time in Scripture that a writer used light as a metaphor for God. [Note: Wiersbe, The . . . Wisdom . . ., p. 145.]

"Light is a natural figure for almost everything that is positive, from truth and goodness to joy and vitality (e.g., respectively, Psalms 43:3; Isaiah 5:20; Psalms 97:11; Psalms 36:9), to name but a few. Here it is the answer to fear (1, 3) and to the forces of evil." [Note: Kidner, p. 120.]

"The phrases ’my light’ and ’my salvation’ mean essentially the same thing." [Note: VanGemeren, p. 243.]

The answer to his rhetorical questions is, of course, no one (cf. Romans 8:31-39).