As to the Western world, in the first place the race which came from the ancient Aryan sources to countries with difficult climates, giving rise to greater responsibilities, became naturally more active. Being obliged to concern themselves more with material things these people found the means of communicating with matter. The result of this is in itself a phenomenon. All these inventions that we see today are no less than a miracle, but a miracle which has come from communication with the things of the earth, as the product of earthly things, and it is as visible and tangible as the earth. It is like a father with two sons: one son produces something all the time, one day a rattle, another day a bicycle, a third day an aeroplane; he always has something to show his father; but the other son may sit quietly, and while perhaps his thoughts and feelings are developing, he has nothing to show. Something may be developing in him which he himself cannot very well define, nor can others see it. Therefore it is natural that progress made in the objective world is visible and tangible, whereas in the spiritual realm it is difficult to see how far someone has progressed.