The Alchemist (Coelho)
According to the old man, what is the one great truth on this planet?
you
you
From the text:
It prepares your spirit and your will, because there is one great truth on this planet: whoever you are, or whatever it is that you do, when you really want something, it's because that desire originated in the soul of the universe. It's your mission on earth."The Alchemist