Wonder no more!!
Check out Matthew 5:21-22 ... the Gospel Appointed for THIS Sunday (from "The Message")
"You're familiar with the command to the ancients, 'Do not murder.' I'm telling you that anyone who is so much as angry with a brother or sister is guilty of murder. Carelessly call a brother 'idiot!' and you just might find yourself hauled into court. Thoughtlessly yell 'stupid!' at a sister and you are on the brink of hellfire. The simple moral fact is that words kill."Doesn't get much clearer than that, kids!