it's written.
Translate for you: Mi Yue: "Ignorant at dusk." Zhen said, "Heaven knows, God knows, I know, and Son knows. What is ignorance?" Come out in shame.
Wang Mi said, "Nobody knows in the middle of the night."
Yang Zhen said, "God knows, God knows, I know, and you know. How can you say that no one knows?" Wang Mi went out in shame.