I believe that it is hard for us to understand "grace" because it is a spiritual concept. Grace is of God not man.
Men believe that we get what we deserve, grace is getting what you do not deserve. We deserve death, but through Jesus Christ we have eternal life. We deserve to be forever seprated from God but grace allows us to not anly become connected again but to become sons through adoption. We have the same rights as the firlst son. Thank you Lord for grace.