How does papa explain to cassie how she needs to be careful about the battles she chooses to fight

Cassie is refusing to apologize to “Miss” Lillian Jean Simms. Pappa explains that she must choose her battles. Some battles must be worth fighting for and some are not. Just as Pappa showed restraint when he didn't pursue Charlie Simms, Cassie would do well not to antagonize a white girl further even though Cassie is in the right.