He maintained the stars and sun to be earthly, and the moon of the same nature as the sun, but illumined by it. Somewhat more valuable would appear to have been his geometrical science, could we with accuracy attribute to Thales many problems claimed also, and more probably, by Pythagoras and later reasoners. He is asserted to have measured the pyramids by their shadows. He cultivated astronomy and astrology; and Laertius declares him to have been the first Greek that foretold eclipses. The yet higher distinction has been claimed for Thales of having introduced among his countrymen the doctrine of the immortality of the soul. But this sublime truth, though connected with no theory of future rewards and punishments, was received in Greece long before his time. Perhaps, however, as the expressions of Cicero indicate, Thales might be the first who attempted to give reasons for what was believed. His reasons were, nevertheless, sufficiently crude and puerile; and having declared it the property of the soul to move itself, and other things, he was forced to give a soul to the loadstone, because it moved iron! These fantastic doctrines examined, and his geometrical or astronomical discoveries dubious, it may be asked, what did Thales effect for philosophy? Chiefly this: he gave reasons for opinions--he aroused the dormant spirit of inquiry--he did for truths what the legislators of his age did for the people--left them active and stirring to free and vigorous competition. He took Wisdom out of despotism, and placed her in a republic--he was in harmony with the great principle of his age, which was investigation, and not tradition; and thus he became the first example of that great truth-- that to think freely is the first step to thinking well. It fortunately happened, too, that his moral theories, however inadequately argued upon, were noble and exalting. He contended for the providence of a God, as well as for the immortality of man. He asserted vice to be the most hateful, virtue the most profitable of all things [193]. He waged war on that vulgar tenacity of life which is the enemy to all that is most spiritual and most enterprising in our natures, and maintained that between life and death there is no difference--the fitting deduction from a belief in the continuous existence of the soul [194]. His especial maxim was the celebrated precept, "Know thyself." His influence was vigorous and immediate. How far he created philosophy may be doubtful, but he created philosophers. From the prolific intelligence which his fame and researches called into being, sprang a new race of thoughts, which continued in unbroken succession until they begat descendants illustrious and immortal. Without the hardy errors of Thales, Socrates might have spent his life in spoiling marble, Plato might have been only a tenth-rate poet, and Aristotle an intriguing pedagogue.