With a truly tragic delusion,” Carl Jung noted, “these theologians fail to see that it is not a matter of proving the existence of the light, but of blind people who do not know that their eyes could see. It is high time we realized that it is pointless to praise the light and preach it if nobody can see it. It is much more needful to teach people the art of seeing.

When the alchemist speaks of Mercurius, on the face of it he means quicksilver (mercury), but inwardly he means the world-creating spirit concealed or imprisoned in matter. The dragon is probably the oldest pictoral symbol in alchemy of which we have documentary evidence. It appears as the Ouroboros, the tail-eater, in the Codex Marcianus, which dates from the tenth or eleventh century, together with the legend ‘the One, the All’. Time and again the alchemists reiterate that the opus proceeds from the one and leads back to the one, that it is a sort of circle like a dragon biting its own tail. For this reason the opus was often called circulare (circular) or else rota (the wheel). Mercurius stands at the beginning and end of the work: he is the prima materia, the caput corvi, the nigredo; as dragon he devours himself and as dragon he dies, to rise again in the lapis. He is the play of colours in the cauda pavonis and the division into the four elements. He is the hermaphrodite that was in the beginning, that splits into the classical brother-sister duality and is reunited in the coniunctio, to appear once again at the end in the radiant form of the lumen novum, the stone. He is metallic yet liquid, matter yet spirit, cold yet fiery, poison and yet healing draught - a symbol uniting all the opposites.

If we do not have the depths, how do we have the heights? Yet you fear the depths, and do not want to confess that you are afraid of them. It is good, though, that you fear yourselves; say it out loud that you are afraid of yourselves. It is wisdom to fear oneself.