Yanzitang, a China idiom, is pinyin, which comes from On the Potential written by Confucius.
"Confucius Conglun the situation": "Yan lives in the house, and the mother and son are safe to eat, and they are happy and think that they are safe; When the stove suddenly burns, the building burns, and the color of the birds remains the same. I don't know what will happen. "
Swallows live in a house. How can children eat them? They like to talk about small favors and think it is safe. Chimneys will rise, houses will burn, sparrows will not change color, and they don't know that disaster is coming. "