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'.
(..) - Oh, hello, Ruth. - How's the baby doing? - She's good. Oh! I have new photos. Oh, thank you. Oh my goodness! Look at those eyes! What do you mean? Do you see something wrong? Oh no, it's just that it seems like she sees more than we do, (..)2005 TvShow: Six Feet Under Title: Everyone's Waiting Season: 5 Episode 12