"Yes, sir, that’s my Saviour,
Je-sus is my Saviour,
Je-sus is my Saviour now.
On the level
‘S not the devil,
Jesus is my Saviour now."

– John Steinbeck

The Grapes of Wrath, Chapter 4. Jim Casy makes his appearance in the novel, singing a parody song about Jesus which is meant to mock organized Christianity. He sings it to the tune of "Yes, Sir, That’s My Baby" and it demonstrates his inner conflict. Once a passionate evangelist, he is no longer the Reverend Jim Casy, because he has become disillusioned with organized religion. He, like Tom Joad, is one of the most important characters in the novel.