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Once upon a time, there was a monk who has cultivated for many years and attained lots of merits in his current life. His goal is to spread the teachings of the buddha every where as long as any sentient being lives.
A follower of him was supposed to aid him in his everyday spreadings of the buddha teachings.
One day, they were supposed to cross to another shore to spread teachings to the beings there. They had to board a ship in order to reach their destination.
On the way, the follower realized the dead fishes and sea creatures caused by the ship when it was moving to the shallow parts of the waters.
At this sight, he had a thought and asked the monk, "Teacher, please enlighten me. As we were reaching the shore, many fishes and other creatures were killed by our big ship which made our destiny possible. So who is to blame for the death of those innocent sea animals? Is it the ship and its sailor, the fishes and creatures themselves, or you my teacher? "
The monk replied, "You, my follower, have to take the blame."
This story tells us of the complexity in human beings' mind, which created the need for a party to take the blame. Initially, every party is doing his normal routines whole-heartedly and there was no intention to kill. But the follower upon seeing the death of the animals, had the "killing" in his mind. Therefore he created the "kill" word. He defied to think of the issue as natural, and in the end cause sufferings to his own mind. This is the root of all sufferings which mankind has brought to themselves.
PS. Great minds do not differentiate good and bad. They simply move towards their goals.