It might be helpful to state that God's mercy helps people. Alternate translation: "because God is compassionate and merciful to us" (See: [[rc://en/ta/man/jit/figs-explicit]])
Light is often a metaphor for truth. Here, the Savior giving spiritual truth to people is spoken of as if he were a sunrise that shines light on the earth. Alternate translation: "the Savior, who is like a sunrise, will come from on high" (See: [[rc://en/ta/man/jit/figs-metaphor]])