In September 1971 Kim Jong Il, with some officials, was looking round the Mupho site where Kim Il Sung had set up a bivouac during the anti-Japanese revolutionary struggle.
One day an official proposed that they go fishing in the Tuman River, which is teeming with chars where it flows near Mupho.
Kim Jong Il accepted the proposal.
While the officials were catching fish, Kim Jong Il was lost in thought, his fishing line drooping in the water. Time passed, but he remained in the same posture. An official tiptoed towards him. He noticed that, although a fish had taken the bait, Kim Jong Il was unaware of it. After a while Kim Jong Il became aware of the official. He said that Mupho was really picturesque, and that sitting there with the fishing line in the water, an idea had flashed into his mind. The official realized that their attempt to get him to rest by taking him fishing had not worked.
Kim Jong Il continued: This river and the forest around here are associated with the glorious career of President Kim Il Sung. No leader in the world has led the revolution and trod such a rugged path as our President did. As the song goes, he is a legendary hero endowed with the spirit of Mt. Paektu and the greatest of all the great men in modern history. His revolutionary ideas far excel the preceding ideas in their depth and breadth, and his revolutionary career is an immortal heroic epic. However, we have failed to clarify the position his revolutionary ideas occupy in world history. His great Juche idea has a powerful appeal to billions of people across the world, but we have so far failed to formulate his revolutionary ideas.
Then he said to himself, “Kimilsungism!...”
“Just as the flow of the Tuman is eternal, so Kimilsungism will shine as the brilliant banner of the people in their struggle even in the future communist society as it does in the contemporary times,” he declared.