What's the story of Shang Tang's leniency policy?

When Shang Tang was a vassal, he once went for a walk in the suburbs and found someone catching birds with a net. To Shang Tang's surprise, there are not one net, but four nets, which tend to be surrounded from all directions.

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For birds, there is only a way in, but no way out.

However, to Shang Tang's surprise, the bird catcher was still mumbling: "Let all the birds in the world enter my net, the more the better, the bigger the better, the fatter the better."

This aroused Shang Tang's sympathy.

He said to the bird catcher, "don't you want to catch all the birds in the world by catching birds like this?" So he asked the bird catcher to remove three of the four sides. He also told the bird catcher that he should say, "If you want to fly left, fly left, if you want to fly right, fly into my net!" " "

When the news reached the governors' ears, they all praised Shang Tang's benevolence, which could be applied to animals, and governors joined in succession. Later, the tribes in Shang Tang became more and more powerful and established the Shang Dynasty.