“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 wildlife and its habitat cannot speak, so we must and we will.”

“A good cause is often injured more by ill-timed efforts of its friends than by the arguments of its enemies. Persuasion, perseverance and patience are the best advocates on questions depending on the will of others.”

“Being constantly in the public eye gives me a special responsibility, particularly that of using the impact of photographs to transmit a message, to sensitize the word to an important cause, to defend certain values.”