Who said "Don't let them see you, don't let them know."?

This quote is attributed to Boo.

Don't let them see you, don't let them know. - Boo

"Don't let them see you, don't let them know."

Boo Fear

"Kitty!"

"I like your hair. It's funny."

"You're my friend. My best friend."

"Don't let them scare you. You're brave."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."