Dr Seuss has so many fantastic books full of good quotes. For a child it is a great read as they can read his quotes and hopefully ponder what they mean and how they apply to life.
This quote seems like one of those quests you go on and the answer was right in front of you the whole time. In the end you learn a lot while on the quest so it was definitely worth the journey but you still feel a bit silly for not seeing the answer before you left.