7. It is, therefore, a farther progress in thought, to comprehend accurately the distinction between mind and nature, and to recognize mind as something higher and contra-distinguished from all natural being. This problem fell to the _Sophists_. They entangled in contradictions, the thinking which had been confined to the object, to that which was given, and gave to the objective world which had before been exalted above the subject, a subordinate position in the dawning and yet infantile consciousness of the superiority of subjective thinking. The Sophists carried their principle of subjectivity, though at first this was only negative, into the form of the universal religious and political changing condition (_Aufklärung_).[1] They stood forth as the destroyers of the whole edifice of thought that had been thus far built, until _Socrates_ appeared, and set up against this principle of _empirical_ subjectivity, that of the _absolute_ subjectivity,—that of the spirit in the form of a free moral will, and the thought is positively considered as something higher than existence, as the truth of all reality. With the Sophist closes our first period, for with these the oldest philosophy finds its self-destruction (_Selbstauflösung_). SECTION IV. THE IONIC PHILOSOPHERS. 1. THALES.—At the head of the Ionic natural philosophers, and therefore at the head of philosophy, the ancients are generally agreed in placing Thales of Miletus, a cotemporary of Crœsus and Solon; although this beginning lies more in the region of tradition than of history. The philosophical principle to which he owes his place in the history of philosophy is, that, “the principle (the primal, the original ground) of all things is water; from water every thing arises and into water every thing returns.” But simply to assume water as the original ground of things was not to advance beyond his myth-making predecessors and their cosmologies. Aristotle, himself, when speaking of Thales, refers to the old “theologians,”—meaning, doubtless, Homer and Hesiod,—who had ascribed to Oceanus and Thetis, the origin of all things. Thales, however, merits his place as the beginner of philosophy, because he made the first attempt to establish his physical principle, without resorting to a mythical representation, and, therefore, brought into philosophy a scientific procedure. He is the first who has placed his foot upon the ground of a logical (_verständig_) explanation of nature. We cannot now say with certainty, how he came to adopt his principle, though he might have been led to it, by perceiving that dampness belonged to the seed and nourishment of things; that warmth is developed from moisture; and that, generally, moisture might be the plastic, living and life-giving principle. From the condensation and expansion of this first principle, he derives, as it seems, the changes of things, though the way in which this is done, he has not accurately determined.