The theme of the Grail is the bringing of life into what is known as 'the wasteland.' The wasteland is the preliminary theme to which the Grail is the answer. . . It's the world of people living inauthentic lives - doing what they are supposed to do.
I think that what we're seeking is an experience of being alive, so that our life experiences on the purely physical plane will have resonance's within our own innermost being and reality, so that we actually feel the rapture of being alive.
The myth is the public dream and the dream is the private myth. If your private myth, your dream, happens to coincide with that of the society, you are in good accord with your group. If it isn't, you've got an adventure in the dark forest ahead of you.