I love this from E B White, check out this link.
"Anyone who writes down to children is simply wasting his time. You have to write up, not down. Children are demanding. They are the most attentive, curious, eager, observant, sensitive, quick, and generally congenial readers on earth. They accept, almost without question, anything you present them with, as long as it is presented honestly, fearlessly, and clearly."
"I arise in the morning torn between a desire to improve the world and a desire to enjoy the world. This makes it hard to plan the day."