“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.”

“The web of our life is of a mingled yarn, good and ill together: our virtues would be proud if our faults whipped them not; and our crimes would despair if they were not cherished by our own virtues.”

“Wisely weigh our sorrow with our comfort.”

“They are sick that surfeit with too much, as they that starve with nothing.”