This morning's first reading at Mass from Genesis 37 tells the story of Joseph and his brothers. Their father Israel loved Joseph best of all his sons; out of jealousy, the brothers plotted to kill Joseph. Indeed, jealousy can be a deadly sin, deadly to the those who are jealous, that is. Therefore, feel sorry for anyone who is jealous of you for whatever reason and pray hard for the person. For only God can change a jealous heart.