How do the speakers build up the poem's theme? A.
God's views are left for the reader to infer, just as humankind is left to infer His reasons for creating the universe and His plan for each human to reach salvation.
B.
God as a speaker puts forth His view on why He withheld the treasure of "rest" so that humankind, having tired of the other material gifts, would turn to Him in their exhaustion.
C.
The introduction of God as a speaker lends authenticity to the argument that God is manipulative because He wants to control humankind by withholding the gift of "rest."
D.
The narrator refers to God in the third person, thus not making Him the speaker, and speculates that God did not bestow the gift of "rest" because he wanted humankind to worship Him.
POEM

The Pulley
by George Herbert

When God at first made Man,
Having a glass of blessings standing by--
Let us, said He, pour on him all we can;
Let the world's riches, which dispersed lie,
Contract into a span.

So strength first made a way,
Then beauty flow'd, then wisdom, honour, pleasure:
When almost all was out, God made a stay,
Perceiving that, alone of all His treasure,
Rest in the bottom lay.

For if I should, said He
Bestow this jewel also on My creature,
He would adore My gifts instead of Me,
And rest in Nature, not the God of Nature:
So both should losers be.

Yet let him keep the rest,
But keep them with repining restlessness;
Let him be rich and weary, that at least,
If goodness lead him not, yet weariness
May toss him to My breast.