“The Lord is my light and my salvation; Whom shall I fear? The Lord is the strength of my life; Of whom shall I be afraid?” (Psalms 27:1)

This is personal. "MY light," "MY salvation"; the saint is secure in his relationship with God and declares it boldly. Before the saint is born again, divine light pours in as the precursor of salvation; if there’s not enough light to reveal our darkness and make us long for the Lord Jesus, there’s no evidence of salvation. After conversion, our God is our joy, comfort, guide, teacher, and in every sense our light: He is light within, light around, light reflected from us, and light to be revealed to us.

It doesn’t just say the Lord gives light, for He IS light; it doesn’t just say He gives salvation, for He IS salvation. The saint by faith holds onto God Himself, as well as  all the covenant blessings. Because of this fact, the next statement makes sense: “Whom shall I fear?” It’s a question with an obvious answer: “If God is for us, who can be against us?... Who shall bring a charge against God's elect? It is God who justifies” (Romans 8:31-33).

The powers of darkness are not to be feared, for Christ died to “destroy him who had the power of death, that is, the devil, and release those who through fear of death were all their lifetime subject to bondage” (Hebrews 2:14-15).

“The Lord is the strength of my life; Of whom shall I be afraid?" “Neither death nor life, nor angels nor principalities nor powers, nor things present nor things to come, nor height nor depth, nor any other created thing, shall be able to separate us from the love of God which is in Christ Jesus our Lord” (Romans 8:38-39).