“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.”

“Be great in act, as you have been in thought.”

“My free drift Halts not particularly, but moves itself In a wide sea of wax; no levelled malice Infects one comma in the course I hold, But flies an eagle flight, bold and forth on, Leaving no tract behind.”

“Talking isn't doing. It is a kind of good deed to say well; and yet words are not deeds.”