It is not in the books of the Philosophers, but in the religious symbolism of the Ancients, that we must look for the footprints of Science, and re-discover the Mysteries of Knowledge.
What does mysticism really mean? It means the way to attain knowledge. It's close to philosophy, except in philosophy you go horizontally while in mysticism you go vertically.
Pythagorean thought was dominated by mathematics, but it was also profoundly mystical.
Alchemy is a kind of philosophy: a kind of thinking that leads to a way of understanding.
The Occultists, however, know that the traditions of Esoteric Philosophy must be the right ones, simply because they are the most logical, and reconcile every difficulty.
Philosophy finds itself to be no longer anything but the heir to a fabulous mystical theology, but missing a God and wiping the slate clean.