The notion that humans had souls appeared to Boesoou to be self-evident. The notion that there was such a thing as the body, apart from the soul, a mere material collection of nerves and tissues—let alone that the body is the prison of the soul; that the mortification of the body could be a means to the glorification or liberation of the soul—all this, it turns out, struck him as utterly new and exotic. Axial Age spirituality, then, is built on a bedrock of materialism.