He whoever bears grudges for a fellow man is like he who imprisoned himself for only when you forgive you srt your self free,and whatever we may say when in an angered state have to be watched because it capable of devulging a long time taught which can kill by mere hearing,jesus so much emphasized on the need for forgiveness fo if the father can forgive our shortcomings who are we not to forgive our offenders? Thats why he included it in our lords prayer.