“The philosophical cross, the two lines running in opposite directions, the horizontal and the perpendicular, the height and breadth, which the geometrizing Deity divides at the intersecting point, and which forms the magical as well as the scientific quaternary, when it is inscribed within the perfect square, is the basis of the occultist. Within its mystical precinct lies the master-key which opens the door of every science, physical as well as spiritual. It symbolizes our human existence, for the circle of life circumscribes the four points of the cross, which represent in succession birth, life, death, and IMMORTALITY.
Everything in this world is a trinity completed by the quaternary, and every element is divisible on this same principle. Physiology can divide man ad infinitum, as physical science has divided the four primal and principal elements in several dozens of others; she will not succeed in changing either. Birth, life, and death will ever be a trinity completed only at the cyclic end. Even were science to change the longed-for immortality into annihilation, it still will ever be a quaternary; for God “geometrizes”!
Therefore, perhaps alchemy will one day be allowed to talk of her salt, mercury, sulphur, and azoth, her symbols and mirific letters, and repeat, with the exponent of the Synthesis of Organic Compounds, that “it must be remembered that the grouping is no play of fancy, and that a good reason can be given for the position of every letter.””
H. P. Blavatsky