Answer:
To swear an oath of brotherhood
Explanation:
The three rioters swore an oath to kill death but greed took a tow on them and they ended up killing each other because of eight bushels of gold they each wanted for their vices.
It helps develop ideas and mood at the appropriate speed.
In the beginning of "The Great Gatsby", Nick brags that he is not at all judgmental and is able to understand where people are coming from. This leads him to trusting people and thinking the best of them. By the end of the novel, after he has had so many uncomfortable and unfortunate experiences tangled up in the lives of Gatsby, Daisy, Tom, Jordan, etc, Nick finds himself to be very judgmental of their lifestyle and personalities, especially the Buchanans. He removes himself from their company and becomes more reserved, less trusting.