Advice to Little Girls by Mark Twain — Read

Good little girls ought not to make mouths at their teachers for every trifling offense. This retaliation should only be resorted to under peculiarly aggravated circumstances.

If you have nothing but a rag-doll stuffed with sawdust, while one of your more fortunate little playmates has a costly China one, you should treat her with a show of kindness nevertheless. And you ought not to attempt to make a forcible swap with her unless your conscience would justify you in it, and you know you are able to do it.