Thales was unquestionably a dualist. Instructed by traditional intimations, or more probably guided by the spontaneous apperceptions of reason, he recognized, with more or less distinctness, an incorporeal Deity as the moving, animating, and organizing cause of the universe. The idea of God is a truth so self-evident as to need no demonstration. The human mind does not attain to the idea of a God as the last consequence of a series of antecedent principles. It comes at once, by an inherent and necessary movement of thought, to the recognition of God as the First Principle of all principles. But when, instead of hearkening to the simple and spontaneous intuitions of the mind, man turns to the world of sense, and loses himself in discursive thought, the conviction of a personal God becomes obscured. Then, amid the endlessly diversified phenomena of the universe, he seeks for a cause or origin which in some form shall be appreciable to sense. The mere study of material phenomena, scientifically or unscientifically conducted, will never yield the sense of the living God. Nature must be interpreted, can only be interpreted in the light of certain _à priori_ principles of reason, or we can never "ascend from nature up to nature's God." Within the circle of mere sense-perception, the dim and undeveloped consciousness of God will be confounded with the universe. Thus, in Anaximenes, God is partially confounded with "air," which becomes a symbol; then a vehicle of the informing mind; and the result is a semi-pantheism. In Heraclitus, the "ether" is, at first, a semi-symbol of the Deity; at length, God is utterly confounded with this ether, or "rational fire," and the result is a definite _materialistic pantheism_. And, finally, when this feeling or dim consciousness of God, which dwells in all human souls, is not only disregarded, but pronounced to be an illusion--a phantasy; when all the analogies which intelligence suggests are disregarded, and a purely mechanical theory of the universe is adopted, the result is the utter negation of an Intelligent Cause, that is, _absolute Atheism_, as in Leucippus and Democritus. CHAPTER IX. THE PHILOSOPHERS OF ATHENS _(continued_). PRE-SOCRATIC SCHOOL _(continued_). IDEALIST: PYTHAGORAS--XENOPHANES--PARMENIDES--ZENO. NATURAL REALIST: ANAXAGORAS. SOCRATIC SCHOOL. SOCRATES. In the previous chapter we commenced our inquiry with the assumption that, in the absence of the true inductive method of philosophy which observes, and classifies, and generalizes facts, and thence attains a general principle or law, two only methods were possible to the early speculators who sought an explanation of the universe--1st, That of reasoning from physical analogies; or, 2d, That of deduction from rational conceptions, or _à priori_ ideas.