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'.
(..) to get to those two days and those are the two days that they totally destroy themselves. l mean, you know, you think to yourself, you say, ''My goodness, l've really pounded these people and worked them to death'' and Friday comes and they say, ''Yeah!'' And then they come in Monday... (..)1983 Bill Cosby: Himself