The spiritually homeless are at greatest danger when life's storms arise. Helping the spiritually homeless requires those who would serve to risk something.
What better and more fitting analogy could there be for the "Son" than to call the source of life and light here on earth the "sun"? Perhaps God's intent was that as we speak of the sun we might pause and see the light (pun intended).
Words have the power of life and death -- you get to choose. The more aware we become of their power the more carefully we will choose our words.