A few quotes you can use are:
1. I got thinkin’ how we was holy when we was one thing, an’ mankin’ was holy when it was one thing..... Fella like that bust the holi-ness. But when they’re all workin’ together, not one fella for another fella, but one fella kind of harnessed to the whole shebang—that’s right, that’s holy. (Chapter 8)
Tom's willingness to help fellow men to fight for their rights and Casy is willing to sacrifice his life for the mankind.
2. “We’re Joads. We don’t look up to nobody. Grampa’s grampa, he fit in the Revolution. We was farm people till the debt. And then—them people. ........These folks is our folks—is our folks. An’ that manager, he come an’ set an’ drank coffee, an’ he says, ‘Mrs. Joad’ this, an’ ‘Mrs. Joad’ that—an’ ‘How you getting’ on, Mrs. Joad?’” She stopped and sighed. “Why, I feel like people again.”
This is about Ma- her self respect, honour, dignity and sense of being fair to everyone. She displays her qulity of fellow ship and social service.
3. Says one time he went out in the wilderness to find his own soul, an’ he foun’ he didn’t have no soul that was his’n. Says he foun’ he jus’ got a little piece of a great big soul. Says a wilderness ain’t no good, ’cause his little piece of a soul wasn’t no good ’less it was with the rest, an’ was whole.
It talks about Jim Casy's wise nature and Tom's changed approach towards life.
4. Wherever they’s a fight so hungry people can eat, I’ll be there. Wherever they’s a cop beatin’ up a guy, I’ll be there. If Casy knowed, why, I’ll be in the way guys yell when they’re mad an’—I’ll be in the way kids laugh when they’re hungry n’ they know supper’s ready. An’ when our folks eat the stuff they raise an’ live in the houses they build—why, I’ll be there. See? God, I’m talkin’ like Casy. Comes of thinkin’ about him so much. Seems like I can see him sometimes.
Complete transformation in Tom's character.
5. A few important quotes
a. “The quality of owning freezes you forever in "I," and cuts you off forever from the "we.” (faith in fellowship)
b. “If you're in trouble, or hurt or need - go to the poor people. They're the only ones that'll help - the only ones.” (belief in equality and poor people)
c. “Don't you love Jesus?' Well, I thought an' I thought an' finally I says, 'No, I don't know nobody name' Jesus. I know a bunch of stories, but I only love people.” (fellowship)
d. “Why, Tom - us people will go on livin' when all them people is gone. Why, Tom, we're the people that live. They ain't gonna wipe us out. Why, we're the people - we go on.'
'We take a beatin' all the time.'
'I know.' Ma chuckled. 'Maybe that makes us tough. Rich fellas come up an' they die, an' their kids ain't no good, an' they die out. But, Tom, we keep a-comin'. Don' you fret none, Tom. A different time's comin'.”
Hope this helps. Let me know if you need anything else on this book:)