In prison, Ren wrote an essay entitled "The buttonwood in front of the rain court", which described the resistance of the buttonwood under the constant attack of torrential rain. He wrote:

"No matter how it is destroyed, it will not be swept away until the autumn wind blows." "The endless destruction of the phoenix tree leaves in the autumn wind can only show that it adds attractive delicacies year after year, and it still gives the prisoners a little coolness in the hot sun until the prison cell becomes a ruin."

This is a true portrayal of his magnificent future, and his big festival is without loss.