Some say that the world has evolved since the creation, as it is the law of nature to evolve. Others say the reverse, seeing the conditions of the world falling back every day. When the Buddhists say that the universe is always progressing, the Hindus contradict this by pointing out that virtue and truth have diminished with the growth of the world during the periods called Satya Yuga, Treta Yuga, Dvapara Yuga and the present Kali Yuga -- the golden, silver, copper and iron ages. There seem to be some who, seeing the comfort and convenience of modern life together with its new inventions and wonderful researches, admire evolution. There are others who praise the past saying how great were the ancestors of the past who were so high in their morals and ideals and who had such a comfort and peace in their natural life-until gradually everything had become so degenerated that all virtues became a prey to the selfishness and artificiality of so-called civilization.