"Psychologically I should say that a person becomes an adult at the point when he produces more than he consumes or earns more than he spends. This may be at the age of eighteen, twenty-five, or thirty-five. Some people remain unproductive and dependent children forever and therefore intellectually and emotionally immature."

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I believe that a good children's book should appeal to all people who have not completely lost their original joy and wonder in life. The fact is that I don't make books for children at all. I make them for that part of us, of myself and of my friends, which has never changed, which is still a child.

— Leo Lionni