It is only when he awakens from this life that he sees that it is unreal. While you are dreaming, if someone would come and tell you, "Do not believe it, it is a dream," you would never believe that, you would think, "It is real." The dream is recognized as a dream, because of the contrast of the physical life, as everything is recognized by its contrast. You say, "Woman," because there is man. Day is recognized by night. But the contrast of the dream of life is very hard to find.