When Judy rebelled, he went to his brother Chun Zhu for help. What four words made Chun Zhu a successful emperor?

Chun Zhu later said only four words, that is? Loyalty and filial piety are princes? . Judy, who was in danger at that time, was very happy after seeing these four words. It is because of these four words that Judy succeeded in claiming the throne. This sentence implies that Judy supports rebellion. As long as it is for loyalty and filial piety, he will support it, regardless of whether Judy will rebel in the end. After Judy finally succeeded in rebellion, she didn't embarrass Chun Zhu, but realized Chun Zhu's wish to let him continue to be a captaincy.