“Adults are only obsolete children.”

“Every once in a while, I get mad. 'The Lorax' came out of my being angry. The ecology books I'd read were dull... In 'The Lorax,' I was out to attack what I think are evil things and let the chips fall where they might.”

“Once-ler! You're making such smogulous smoke - my poor swomee swans, why they can't sing a note! No one can sing who has smog in his throat.”

“You ought to be thankful a hole heaping lot, for The places and people you're lucky you're not!”

“Plant a new Truffula. Treat it with care. Give it clean water. And feed it fresh air.”

“Difficulties exist to be surmounted.”

“The fears you don’t face control you. The fears you face, you move beyond.”

“As I look back at the entire tapestry of my life, I can see from the perspective of the present moment that every aspect of my life was necessary and perfect. Each step eventually led to a higher place, even though these steps often felt like obstacles or painful experiences.”