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'.
(..) the rest of my life. Now, I know I can never bring that lad back. All I can do with time I've got left is bring a little goodness into the world. That's all any of us can do, isn't it? Never too late to stop robbing people, to stop killing people. Start helping people. (..)2016 TvShow: Game of Thrones Title: The Broken Man Season: 6 Episode 7