“Know this: I, Mercurius, have here set down a full, true and infallible account of the Great Work. But I give you fair warning that unless you seek the true philosophical gold and not the gold of the vulgar, unless you heart is fixed with unbending intent on the true Stone of the Philosophers, unless you are steadfast in your quest, abiding by God’s laws in all faith and humility and eschewing all vanity, conceit, falsehood, intemperance, pride, lust and faint-heartedness, read no farther lest I prove fatal to you. For I am the watery venomous serpent who lies buried at the earth’s centre; I am the fiery dragon who flies through the air. I am the one thing necessary for the whole Opus. I am the spirit of metals, the fire which does not burn, the water which does not wet the hands. If you find the way to slay me you will find the philosophical mercury of the wise, even the White Stone beloved of the Philosophers. If you find the way to raise me up again, you will find the philosophical sulphur, that is, the Red Stone and Elixir of Life. Obey me and I will be your servant; free me and I will be your friend. Enslave me and I am a dangerous enemy; command me and I will make you mad; give me life and you will die.”