Wei Linggong: "People with lofty ideals are benevolent, but they have to kill themselves as benevolent." In order to be perfect, you can disregard your own life. After that, it means sacrificing one's own life to defend the just cause.
Give up one's life for justice ((Mencius)): It means to sacrifice one's own life in order to safeguard justice.
But Mencius said, "Give up life for righteousness, and kill life for benevolence."