Among the ethical principles which Pythagoras taught was that men ought not to pray for anything in particular, since they do not know what is good for them; that drunkenness was identical with ruin; that no one should exceed the proper quantity of meat and drink; that the property of friends is common; that men should never say or do anything in anger. He forbade his disciples to offer victims to the gods, ordering them to worship only at those altars which were unstained with blood. Pythagoras was the first person who introduced measures and weights among the Greeks. But it is his philosophy which chiefly claims our attention. His main principle was that _number_ is the essence of things,--probably meaning by number order and harmony and conformity to law. The order of the universe, he taught, is only a harmonical development of the first principle of all things to virtue and wisdom. He attached much value to music, as an art which has great influence on the affections; hence his doctrine of the music of the spheres. Assuming that number is the essence of the world, he deduced the idea that the world is regulated by numerical proportions, or by a system of laws which are regular and harmonious in their operations. Hence the necessity for an intelligent creator of the universe. The Infinite of Anaximander became the One of Pythagoras. He believed that the soul is incorporeal, and is put into the body subject to numerical and harmonical relation, and thus to divine regulation. Hence the tendency of his speculations was to raise the soul to the contemplation of law and order,--of a supreme Intelligence reigning in justice and truth. Justice and truth became thus paramount virtues, to be practised and sought as the end of life. "It is impossible not to see in these lofty speculations the effect of the Greek mind, according to its own genius, seeking after God, if haply it might find Him." We now approach the second stage of Greek philosophy. The Ionic philosophers had sought to find the first principle of all things in the elements, and the Pythagoreans in number, or harmony and law, implying an intelligent creator. The Eleatics, who now arose, went beyond the realm of physics to pure metaphysical inquiries, to an idealistic pantheism, which disregarded the sensible, maintaining that the source of truth is independent of the senses. Here they were forestalled by the Hindu sages.