Wise Blood: Foil 1 key example

Chapter 9
Explanation and Analysis—Prophets and Profits:

As a character, Onnie-Jay sheds light on the intersection—and collision—between religion and moneymaking. Interspersing his dialogue with alliteration, oxymoron, and irony, O'Connor characterizes Onnie-Jay as a scam artist. He also acts as a foil for the brooding, tormented Hazel. Onnie-Jay provides comic relief but also shows that the aim of making money off of religious activities doesn't tend to coexist with sincere faith. 

Chapter 13
Explanation and Analysis—Prophets and Profits:

As a character, Onnie-Jay sheds light on the intersection—and collision—between religion and moneymaking. Interspersing his dialogue with alliteration, oxymoron, and irony, O'Connor characterizes Onnie-Jay as a scam artist. He also acts as a foil for the brooding, tormented Hazel. Onnie-Jay provides comic relief but also shows that the aim of making money off of religious activities doesn't tend to coexist with sincere faith. 

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