“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.”

“Love is heavy and light, bright and dark, hot and cold, sick and healthy, asleep and awake- its everything except what it is! (Act 1, scene 1)”

“This knot of nature is so well tied that nobody was ever cunning enough to find the two ends.”

“It is the last lesson of modern science, that the highest simplicity of structure is produced, not by few elements, but by the highest complexity.”