χάρις — charis
Grace as a gift or blessing brought to man by Jesus Christ: grace, favour.
In the thousands of years that had stretched between Adam and Eve’s sin and the coming of the Saviour, it must have been so easy to doubt that God would keep his promises. He wasn’t obliged to do anything, the only thing that bound him was his own word.
At this point, it is important to remind you that God, the hero of the tale, wasn’t just coming to save some helpless, hapless people (although he was), he was coming to save his enemies from self-imposed bondage to death. That’s us by the way, man.
Now that is undeserved mercy, that right there is grace.