As to his philosophy, Xenophanes in the first place maintained absolute existence to be the one, and likewise called this God. “The all is One and God is implanted in all things; He is unchangeable, without beginning, middle or end.”[48] In some verses by Xenophanes found in Clemens of Alexandria (Strom. V. 14, p. 714, ed. Potter), it is said:
“One God is greatest amongst gods and men.
Neither like unto mortals in spirit or in form;”
and in Sextus Empiricus (adv. Math. IX. 144):
“He sees everywhere, thinks everywhere, and hears everywhere,”
to which words Diogenes Laertius (IX, 19) adds: “Thought and reason are everything and eternal.” By this Xenophanes denied the truth of the conceptions of origination and of passing away, of change, movement, &c., seeing that they merely belong to sensuous perception. “He found,” says Tennemann (Vol. I. p. 156) “all origination to be inconceivable:” the One as the immediate product of pure thought, is, in its immediacy, Being.
For us the determination of Being is already known and trivial, but if we know about Being, the One, we place this, as a particular determination, in a line with all the rest. Here, on the contrary, it signifies that all else has no reality and is only a semblance. We must forget our own ideas; we know of God as Spirit. But, because the Greeks only had before them the sensuous world, these gods of their imagination, and found in them no satisfaction, they rejected all as being untrue, and thus came to pure thought. This is a wonderful advance, and thought thus becomes for the first time free for itself in the Eleatic school. Being, the One of the Eleatic school, is just this immersion in the abyss of the abstract identity of the understanding. Just as this comes first, so it also comes last, as that to which the understanding comes back, and this is proved in recent times when God is grasped only as the highest Being. If we say of God that this the highest Being is outside of and over us, we can know nothing more of it but that it is, and thus it is the undetermined; for if we knew of determinations, this would be to possess knowledge. The truth then simply is that God is the One, not in the sense that there is one God (this is another determination), but only that He is identical with Himself; in this there is no other determination, any more than in the utterance of the Eleatic school. Modern thought has, indeed, passed through a longer path, not only through what is sensuous, but also through philosophic ideas and predicates of God, to this all negating abstraction; but the content, the result arrived at is the same.
With this the dialectic reasoning of the Eleatics is closely connected in respect that they have also proved that nothing can originate or pass away. This deduction is to be found in Aristotle’s work, De Xenophane, Zenone et Gorgia, c. 3. “It is impossible, he says,[49] that if anything is, it arises (and he even applies this to the Godhead); for it must arise either from the like or from the unlike. But both are equally impossible: for it is no more probable that the like should be engendered from the like, than that it should engender it, for the like must have determinations identical with one another.” In acknowledging similarity, the distinction between begetting and begotten falls away. “Just as little can unlike arise from unlike, for if from the weaker the stronger takes its rise; or from the smaller, the greater; or from the worse, the better: or if, conversely, the worse proceeds from the better, non-being would result from Being: this is impossible, and thus God is eternal.” The same thing has been expressed as Pantheism or Spinozaism, which rests on the proposition ex nihilo fit nihil. The unity of God is further proved by Xenophanes: “If God is the mightiest, He must be One; for were He two or more, He would not have dominion over the others, but, not having dominion over the others, He could not be God. Thus were there several, they would be relatively more powerful or weaker, and thus they would not be gods, for God’s nature is to have nothing mightier than He. Were they equal, God would no longer possess the quality of being the mightiest, for the like is neither worse nor better than the like”—or it does not differ therefrom. “Hence if God is, and is such as this, He is only one; He could not, were there several, do what He willed. Since He is one, He is everywhere alike. He hears, sees and has also the other senses everywhere, for were this not the case, the parts of God would be one more powerful than the other, which is impossible. Since God is everywhere alike, He has a spherical form, for He is not here thus and elsewhere different, but is everywhere the same. Since He is eternal and one and spherical in form, He is neither unlimited nor limited. To be unlimited is non-being; for that has neither middle, beginning, end, nor part; and what is unlimited corresponds to this description. But whatever non-being is, Being is not. Mutual limitation would take place if there were several, but since there is only One, it is not limited. The one does not move itself, nor is it unmoved; to be unmoved is non-being, for to it none other comes, nor does it go into another; but to be moved must mean to be several, for one must move into another. Thus the One neither rests nor is it moved, for it is neither non-being nor is it many. In all this God is thus indicated; He is eternal and One, like Himself and spherical, neither unlimited nor limited, neither at rest nor moved.” From this result, that nothing can arise from the like or from the unlike, Aristotle (De Xenophane, Zenone et Gorgia c. 4) draws this conclusion: “that either there is nothing excepting God, or all else is eternal.”
We here see a dialectic which may be called metaphysical reasoning, in which the principle of identity is fundamental. “The nothing is like nothing and does not pass into Being or conversely; thus nothing can originate from like.” This, the oldest mode of argument, holds its place even to the present day, as, for example, in the so-called proof of the unity of God. This proceeding consists of making presuppositions such as the power of God, and from them drawing conclusions and denying the existence of predicates; that is the usual course in our mode of reasoning. In respect of determinations, it must be remarked that they, as being negative, are all kept apart from the positive and merely real being. We reach this abstraction by a more ordinary way, and do not require a dialectic such as that of the Eleatic school: we say God is unchangeable, change concerns finite things alone (which we represent as an empirical proposition); on the one hand we thus have finite things and change, and on the other, unchangeableness in this abstract absolute unity with itself. It is the same separation, only that we also allow the finite to be Being, which the Eleatics deny. Or else we too proceed from finite things to kinds and genera, leaving the negative out bit by bit; and the highest order of all is God, who, as the highest Being, is affirmative only, but devoid of any determination. Or we pass from what is finite to the infinite, for we say that the finite as limited must have its basis in the infinite. In all these different forms which are quite familiar to us, there is the same difficult question which exists in reference to the Eleatic thought. Whence comes determination and how is it to be grasped—how is it in the one, leaving the finite aside, and also how does the infinite pass out into the finite? The Eleatics in their reflections were distinguished from this our ordinary reflecting thought, in that they went speculatively to work (the speculative element being that change does not exist at all) and that they thus showed that, as Being was presupposed, change in itself is contradictory and inconceivable. For from the one, from Being, the determination of the negative, of the manifold, is withdrawn. Thus while we, in our conception, allow the actuality of the finite world, the Eleatics are more consistent, in that they proceeded to say that only the One exists and that the negative does not exist at all;—a consequence which, if it necessarily arouses in us surprise, still none the less remains a great abstraction.
Sceptics saw in this the point of view of the uncertainty of all things, and Sextus several times[50] quotes verses such as these:—