I heard a story years ago and while I’ve forgotten the details, the gist was something like this. Perhaps someone else can fill in the details.
When R’ Chaim Brisker was a kid his father sent him to learn under a local melamed. At one point during the day, the melamed went out of the room for a few minutes, and some minor crime was committed. When the rebbe returned to the room, he placed the blame on a poor boy, whose father was unable to pay much for his son’s participation, instead of a rich boy whose father paid well. Chaim stormed out and refused to return. He explained to his father, the Beis Halevi, that he could not learn under someone who perpetrated such injustice, and his father did not send him back.
Unrelated, but another good story about R’ Chaim as a kid:
Once, he had an altercation with another boy. It was reported to the Beis Halevi that Chaim had struck the boy two times. The Beis Halevi asked the boy why he had done that, and Chaim explained that the other boy had hit him first.
“But he only hit you once,” the Beis Halevi objected. “Why did you hit him back two times?”
“I had to hit him twice,” Chaim explained. “One time to pay him back for hitting me. And the second time because he had hit me for no reason so I had to hit him also for no reason.”