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'.
(..) - Now listen close. - If you marry me... - Mm-hmm. then you will have lost a life long battle of defiance against them. Oh my goodness, what are we going to do? - I do not know. - Huh! Hey, band, you feeling all right? (..)2004 The Notebook
(..) - Relax, pal, it's all set up. We're meeting her for the late show. Look... what did I tell you? Come on. Oh my goodness, what a coincidence! I need to talk to you for a second. - He's here! - Allie, you remember Noah, don't you? (..)2004 The Notebook