The famous saying "Being righteous is courageous". From "Zuo Zhuan: The Sixteenth Year of Duke Ai"

Original text

When Jian, the eldest son of Chu, encountered slander, His father went to Song Dynasty from the city. He also brought about the Hua clan's rebellion in Zheng, and the people of Zheng were very kind to it. He was also in Jin Dynasty and planned to attack Zheng with the Jin people in order to recover Yan. The people of Zheng returned to their original state. The people of Jin sent a spy to Zimu, and asked him to go and look forward to it. Zimu abused his private town, and the people of the town complained. The Zheng people saved it and got the Jin spies. Then he killed Zimu. His son, called Sheng, lived in Wu. Zixi wanted to call him, but Ye Gong said: "I heard that the victory was also deceitful and chaotic. Isn't it harmful?" Zixi said: "I heard that the victory was also trustworthy and courageous. I did not do anything disadvantageous. I gave up all the odds to make Wei Fan. "Ye Gong said: "Zhou Ren is called faith, and being righteous is called courage. When I hear victory, I like to reply, but asking for death is not selfish? Replying to words is not faith. Expecting to die is not brave. I will regret it.” He summoned his envoy to Wu Jing and appointed him as Lord Bai. Inviting to attack Zheng, Zixi said: "Chu is not a festival. Otherwise, I will not forget it." The next day, I invited him again and promised him. Before the army was launched, the Jin people attacked Zheng, but Chu rescued them and made an alliance with them. Sheng Nu said, "The people of Zheng are here, and their enemies are not far away."