Forever the truth shines in the eternal kingdom of Light but the world of mind wherein our terrestrial nature moves, has its astrological laws, comparable to those that rule in the visible world and are known to astronomy. As the earth recedes from the sun in winter time and approaches it in the summer, so the spiritual evolution of man has its periods of spiritual enlightenment and of mental darkness, and there are little periods within the large periods, as here are days and nights in the year. Man, whether considered as representing humanity as a whole, a nation a people, a family, or an individual, resembles a planet revolving around its own axis between the two poles of birth and decay. That which is uppermost turns down and that which is below rises again to the surface. Truths disappear and are forgotten only to reappear again embodied in new and perhaps improved forms. Civilizations, systems of philosophy, religion and science come and go and come again, the absurdities of fashion that have been the pride of our parents and were laughed at by us become again the objects of admiration for our children, and the forgotten wisdom of the past will be again the wisdom of future generations. Thus the wheel would ever revolve in a circle, there would be no progress and no object of life, if the presence of the eternal sun of Divine Wisdom acting upon the centre of the wheel did not attract it towards itself and thus in the course of ages gradually transform the circular motion into a spiral gyration. At every turn of the great wheel its axis moves imperceptibly a little nearer to the source of all Life, although every period of evolution begins again at the foot of the ladder. The ladder upon which we are climbing stands perhaps upon a little higher ground than the one upon which our ancestors climbed, or which we climbed ourselves during previous incarnations; but there are many steps upon it which our forefathers have ascended and which we shall have to reach. The science of medicine forms no exception to this general rule, and we may safely assert that _the system of medicine of Theophrastus Paracelsus, in its recognition of fundamental laws of nature is of such a high character that it will be for the medical science of the coming centuries to grow up to its understanding_, nor will this advance in science be possible without a corresponding development, and this development will be inaugurated by a correct conception of the constitution of man.