"Today you are You, that is truer than true. There is no one alive who is Youer than You." Theodor Seuss Geisel's 48 tongue-twisting, rhyming tales have transported tots on journeys to magical locales and inspired generations to pick up a book and read. In honor of what would have been Dr. Seuss's 110th birthday today, we've pulled some of our favorite quotes. See if you can guess which book they are from.