It is a book about both, and I would like to emphasise that both are more closely related than we would typically assume. There is this feeling that “there is this real world we live in and then there is some ethereal spiritual world disconnected from us”. Ocean of Self emphasises that the so-called spiritual world is fundamental to our physical world; that is, the spiritual world gives rise to the world with which our physical senses are familiar. Our physical world can therefore be understood as an expression of the spiritual world. It’s not the other way around! As I take the reader through the earlier chapters on the ocean and ocean diving, I’m introducing spiritual concepts that are expanded on in the later chapters.