For what is this "sword of detachment" but another aspect of the "fiery sword" of Simon, which is turned about to guard the way to the Tree of Life? This "sword" is our passions and desires, which now keep us from the golden-leaved Tree of Life, whence we may find wings to carry us to the "Father in Heaven." For once we have conquered Desire and turned it into spiritual Will, it then becomes the "Sword of Knowledge"; and the way to the Tree of Spiritual Life being gained, the purified Life becomes the "Wings of the Great Bird" on which we mount, to be carried to its Nest, where peace at last is found. The simile of the Tree is used in many senses, not the least important of which is that of the heavenly "vine" of the reïncarnating Soul, every "life" of which is a branch. This explains Simon's citation of the Logion so familiar to us in the _Gospel according to Luke_: Every tree not bearing good fruit is cut down and cast into the fire. This also explains one of the inner meanings of the wonderful passage in the _Gospel according to John_: I am the true vine and my Father is the husbandman. Every branch in me that beareth not fruit he taketh away; and every branch that beareth fruit he purgeth it that it may bear more fruit.[131] For only the spiritual fruit of every life is harvested in the "Store-house" of the Divine Soul; the rest is shed off to be purified in the "Fire" of earthly existence. Into the correspondence between the world-process of Nature, and that which takes place in the womb of mortal woman, it will not be necessary to enter at length. No doubt Simon taught many other correspondences between the processes of Cosmic Nature and Microcosmic Man, but what were the details of this teaching we can in no way be certain. Simon may have made mistakes in physiology, according to our present knowledge, but with the evidence before us all we can do is to suspend our judgment. For in the first place, we do not know that he has been correctly reported by his patristic antagonists, and, in the second, we are even yet too ignorant of the process of the nourishment of the foetus to pronounce any _ex cathedrâ_ statement. In any case Simon's explanation is more in agreement with Modern Science than the generality of the phantasies on scientific subjects to which the uninstructed piety of the early Fathers so readily lent itself. As to whether the Initiated of the ancients did or did not know of the circulation of the blood and the functions of the arterial system, we must remain in doubt, for both their well known method of concealing their knowledge and also the absence of texts which may yet be discovered by the industry of modern exploration teach us to hold our judgment in suspense.