What is grace?

Another (well, let's face it, the only) blog that I follow asked this question this week and I remembered old Granny from Flannery O'Connor's "A Good Man is Hard to Find." I love that granny.

"I wasn't there so I can't say He didn't," The Misfit said. "I wisht I had of been there," he said, hitting the ground with his fist. "It ain't right I wasn't there because if I had of been there I would of known. Listen lady," he said in a high voice, "if I had of been there I would of known and I wouldn't be like I am now." His voice seemed about to crack and the grandmother's head cleared for an instant. She saw the man's face twisted close to her own as if he were going to cry and she murmured, "Why you're one of my babies. You're one of my own children !" She reached out and touched him on the shoulder. The Misfit sprang back as if a snake had bitten him and shot her three times through the chest. Then he put his gun down on the ground and took off his glasses and began to clean them."