Actually About Life of A Buddhist Monk called "Shin Mahar Monggalan".He Killed His Parents Bcoz Of His Wife.Coz He wished to Become a Buddhist Monk in another life and His wife ask him to Kill his parents to prove his love and His wife cursed him "You many never become a monk and found enlightenment if you couldn't kill your parents and prove your love.So,He did kill his parents and In another life,he become one of the Greatest monk among all the Monks led by Buddha.But Even He was most powerful monk after Buddha He couldn't avoided Karma and He was killed by 500 Thieves coz He Killed his parents in his past life.That's why Buddha Said "Never Insult Your Parents even with Your Mind".