Who said "I was min'in' my own business."?

This quote is attributed to Lennie Small.

I was min'in' my own business. - Lennie Small

"I was min'in' my own business."

Lennie Small

Character in Of Mice and Men

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"I get to tend the rabbits... I get to tend 'em and feed 'em"

"I didn't mean to... I didn't mean to do it"

"I ain't got no people"

"We gonna have a little house"