We can follow our bitterness all the way to hell. A former inmate of a Nazi concentration camp was visiting a friend who had shared the ordeal with him. Well, I haven't. If the only evil we overcome is the evil in our own hearts, that is a big victory - and it is a battle we cannot afford to lose. Somebody must stop the cycle of hate and revenge, and Paul says that we are elected to do it.
Murder begins in the heart.
In the heart is where you will stop the cycle of hatred. The Ministers Manual for 1998, p. 177.