Michael McGruther at 2012-05-14 10:34:19:
There are really only two prayers that people say to G-d - "I'm sorry, I'm sorry, I'm sorry" and "Thank you, thank you, thank you"
He could have just said "Thank you" and the impact would be there. But to be silent, when the character is clearly feeling the actual presence of G-d, would be to continue pretending He wasn't there.
The character is in communion with the creator of the Universe in a really profound way. It's metaphor. He's beaten and alone on a raft in the middle of the ocean.
The only way to make this work without dialogue would be to make him weep.