-MORE GRACE PLEASE- 

Telling someone, whether sinner or saint, that they "need to be careful with this grace stuff" is like telling a drowning person, that they need to be careful with a life raft, or telling a an lost in the desert that he needs to be careful about finding food, water and shelter, or telling a man who has been covered in gasoline and set on fire that he needs to be careful with a fire extinguisher.