"So then, let’s suppose that you were able every night to dream any dream you wanted to dream.
And you would, naturally, as you began on this adventure of dreams, you would fulfill all your wishes. You would have every kind of pleasure during your sleep. And after several nights you would say “Well that was pretty great”. But now let’s have a surprise, let’s have a dream which isn’t under control, where something is gonna happen to me that I don’t know what it's gonna be.
Then you would get more and more adventurous and you would make further- and further-out gambles what you would dream. And finally, you would dream where you are now. You would dream the dream of living the life that you are actually living today..."