his own word.
so jesus is again trying to spell it out for the disobedient kids. he says the act of killing begins in the heart, and if you hate your brother then you have already started walking the path of murder. this is related to verse 44 where jesus says to "love your enemies." jesus here extends the definition of sin back to the original. he makes the case that sin separates from god, even if the sin is limited to the heart. god has always connected together attitude with behavior, and has always said that the penalty for sin in either or both is separation from god.
when they made 