Mythical thinking distinguishes two types of fire. The Stoics spoke of a terrestrial fire and an ethereal fire. The latter corresponded to Nous, the divine Logos, and is analogous to the later Christian conception of the Holy Spirit. Bevan describes the concept of ethereal fire as follows: “All round the world was an envelope of the fiery ether, pure and unmixed, but it also penetrated the whole mass, as its soul” ( Bevan, Stoics and Sceptics, p. 43 )