The shorthand for grace is "mercy not merit." Grace is getting what you don't deserve and not getting what you do deserve. Karma is all about getting what you deserve. Christianity teaches that getting what you deserve is death with no hope of resurrection. Grace is the opposite of karma. While everyone desperately needs it, grace is not about us. Grace is fundamentally a word about God: his uncoerced initiative and pervasive, extravagant demonstrations of care and favor.
Justin Holcomb, On The Grace of God