"A library outranks any other one thing a community can do to benefit its people. It is a never failing spring in the desert."- AndrewCarnegie
I’m pretty sure it’s art.
Answer:
Twain believed that obeying is the best policy because if children don't behave, their parents will make them do it regardless. Twain instructs the youth to avoid violence by actually enforcing it upon someone, and then regretting it and apologizing for acting in such an uncivil way.