"Until we learn to manage and maintain a sustainable living relationship with the Earth, then, and only then will we be truly living with the land." This quote is my personal favorite from Living With the Land. I do enjoy the Spaceship Earth quote as previously mentioned. Another quote regarding the future, (though it isn't Epcot) is "...in the future packages will be sent to distant worlds through beams of light," from the old FedEx advertisement at Space Mountain.
"...then, and only then, will we be truly living with the land."