She agreed to help him 'out of the goodness of her heart'. [=because she is a kind and generous person]
He finally got a raise. 'Goodness knows' he deserved one. [=he certainly deserved one]
If you cook the vegetables too long, they'll lose all their (natural) 'goodness'.
(..) she didn't have nobody to help her. Like I said-- With Mr Ewell and seven children on the place? You did all this choppin' and work out ofsheer goodness, boy? You're a mighty good fella, it seems. Did all that for not one penny? Yes, sir. I felt right sorry for her. (..)1962 To Kill a Mockingbird
(..) Jean Louise Finch! Good afternoon, Miss Dubose. My, you look like a picture this afternoon. He don't say a picture ofwhat. My goodness gracious, look at your flowers. Have you ever seen anything more beautiful? Miss Dubose, the gardens at Bellingrath have nothing to compare... (..)1962 To Kill a Mockingbird