Answer:
The answer would either be to "explain why the speaker refers to God" or "provide a justification for the way the speaker feels"
Explanation: The answer could be
to "explain why the speaker refers to God" because when the speaker says "
I blest His name that gave and took", the speaker is most likely praying to a deity.
The answer could be to
"provide a justification for the way the speaker feels" because when it says "And when I could no longer look, I blest His name that gave and took," the speaker is most likely saying that when the speaker could no longer ask for anything else from this deity, the speaker prayed for all of the things this deity has given to the speaker and drastic events that happened in the speaker's life.