way is taken, it leads back to the point from which it started.” It is a constantly self-contradictory and disintegrating movement. To human ideas, now this is held to be reality and now its opposite, and then again a mixture of both. Simplicius quotes further, in writing on Aristotle’s Physics (p. 17 a; 31, 19): “But the truth is only the ‘is’; this is neither begotten of anything else, nor transient, entire, alone in its class (_μουνογενές_), unmoved and without end; it neither was, nor will be, but is at once the all. For what birth wouldst thou seek for it? How and whence should it be augmented? That it should be from that which is not, I shall allow thee neither to say nor to think, for neither can it be said or thought that the ‘is’ is not. What necessity had either later or earlier made it begin from the nothing? Thus must it throughout only be or not be; nor will any force of conviction ever make something else arise out of that which is not. Thus origination has disappeared, and decease is incredible. Being is not separable, for it is entirely like itself; it is nowhere more, else would it not hold together, nor is it less, for everything is full of Being. The all is one coherent whole, for Being flows into unison with Being: it is unchangeable and rests securely in itself; the force of necessity holds it within the bounds of limitation. It cannot hence be said that it is imperfect; for it is without defect, while non-existence is wanting in all.” This Being is not the undetermined (_ἄπειρον_) for it is kept within the limits of necessity; we similarly find in Aristotle that limitation is ascribed to Parmenides. The sense in which the expression “limit” is to be taken is uncertain. According to Parmenides, however, this absolute limitation is as _Δίκη_, absolute necessity clearly determined in itself; and it is an important fact that he went beyond the uncultured conception of the infinite. “Thought, and that on account of which thought is, are the same. For not without that which is, in which it expresses itself (_ἐν ᾦ πεφατισμένον ἐστίν_), wilt thou find Thought, seeing that it is nothing and will be nothing outside of that which is.” That is the main point. Thought produces itself, and what is produced is a Thought. Thought is thus identical with Being, for there is nothing beside Being, this great affirmation. Plotinus, in quoting (V. Ennead. I. 8) this last fragment says: “Parmenides adopted this point of view, inasmuch as he did not place Being in sensuous things; identifying Being with Thought, he maintained it to be unchangeable.” The Sophists concluded from this: “All is truth; there is no error, for error is the non-existent, that which is not to be thought.”