What are the purpose of the Christ's model prayer?

The Jesus Prayer is used for repentance, growing in humility, developing clarity of mind, experiencing the Presence of God, and aligning oneself with the Lord.

Explanation:

To just thank God for giving you the life you have

hope it helps but I'm not really sure

Bernard ignores the conversation because he knows his fate would be sealed even more if he spoke up.

Explanation:

In the conversation between Mond, John and Helmholtz he knows that Mond will have the upper hand and anything that Bernard might say about what he was willing to do against the new society by reading the texts and organizing people who fail even further.

So he stays silent and only  talks up to beg Mond to reduce his sentence for his crime of doing it but his friends had until them pretty much spilled the beans and had engaged in a discussion about the things they were doing.