What does miss kinnian mean she says, "You'll show them all."?

Miss Kinnian says this to make Charlie understand that no matter what other people say...... he'll make out. She's giving him a complement that he doesn't comprehend.

"She said for a person who God gave so little to you did more than a lot of people with brains they never even used. I said that all my friends are smart people and their good. They like me and they never did anything that wasnt nice. Then she got something in her eye and she had to run out to the ladys room."