It is from the spiritual hierarchy that come all the religions of the world. There the question may arise, "Then why do they differ so greatly?" Because the peoples to whom they are given differ greatly. The difference of temperament and viewpoint between the Orient and the Occident is enormous. We are evolving along the outer, the objective, and our civilization represents the material conquest of nature. They are evolving the inner, the subjective. In the Orient the common trend of conversation is philosophical, just as in the Occident it is commercial. Such different types of mind require somewhat different statements of ethics, but the fundamental principles of all religions are identical. When a new era in human evolution begins a World Teacher comes into voluntary incarnation and founds a religion that is suited to the requirements of the new era. Humanity is never left to grope along alone. All that it can comprehend and utilize is taught it in the various religions. World Teachers, the Christs and saviours of the race, have been appearing at propitious times since humanity began existence. Most readers will probably agree that a World Teacher known as the Christ did come and found a religion nearly two thousand years ago. Why do they think so? They reply that God so loved the world that he sent his Son, the Christ, to bring it light and life. If that is true how can we avoid the conclusion that He, or his predecessors, must have come many a time before? The belief that He came but once is consistent only with the erroneous notion that Genesis is history instead of allegory, and that the earth is about six thousand years old! Science has not determined its age but we know that it is very old, indeed. Many eminent scientists have made rough estimates, taking into consideration all that we have learned from astronomy, geology and archeology. Phillips, the geologist, basing his calculations upon the time required for the depositions of the stratified rocks, put the minimum age at thirty-eight million years and the maximum age at ninety-six million years. Sir George Darwin, basing his calculation wholly upon astronomical data, puts the earth's age at a minimum of fifty-six million years. Joly arrived at his estimate by a calculation of the time required to produce the sodium content of the ocean, and concluded that the age of the earth is between eighty million and one hundred million years. Sollas is said to have made careful study of the matter and he finds the minimum to be eighty million, and the maximum age to be one hundred and fifty million years. But perhaps the most exhaustive study of the matter, and that made by the use of the later scientific knowledge, was by Bosler, of the French scientists. He bases his calculations upon the radio-activity of rocks and arrives at a minimum earth age of seven hundred and ten millions of years. Thus it will be observed that as our knowledge grows the estimated age of the earth increases.