How was Atticus generous towards Cunningham?

Atticus did work for Mr. Cunningham and allowed him to pay what he was able.... whenever he was able.

.... I asked Atticus if Mr. Cunningham would ever pay us.
“Not in money,” Atticus said, “but before the year’s out I’ll have been paid. You watch.”
We watched. One morning Jem and I found a load of stovewood in the back yard. Later, a sack of hickory nuts appeared on the back steps. With Christmas came a crate of smilax and holly. That spring when we found a crokersack full of turnip greens, Atticus said Mr. Cunningham had more than paid him.

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