Regarding Lycurgus, founder of Sparta.
The pivotal moment in the creation of Sparta came when Lycurgus proposed radical laws that would transform the state into some of the greatest warriors in history.
A member of the assembly was so offended that he struck Lycurgus in the eye. Lycurgus could easily have killed him and everyone knew it.
Instead, he stood there with his eye destroyed and invited that man to his house for dinner, ultimately convincing the man to become one of his greatest supporters.
Once the laws were in place, Lycurgus left for the temple, saying the laws could not change until he returned. Then Lycurgus starved himself to death.
BAMF.
The lesson here is that revenge is for the weak.