Final answer:
The possessor of the second voice in the poem tries to challenge Pi's faith in God in the earlier stanzas, but becomes more understanding and empathetic towards Pi's belief in the later stanzas.
Step-by-step explanation:
In the poem, the speaker's voice does indeed change in the last two stanzas. In the first part, the speaker is questioning Pi's belief in God and trying to challenge his faith. However, in the last two stanzas, the speaker becomes more understanding and empathetic, acknowledging that Pi needs his faith to survive. The person being addressed remains the same throughout the poem, which is Pi.