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STRANGER: Then now, on the supposition that they are improved, let us ask them to state their views, and do you interpret them.

THEAETETUS: Agreed.

STRANGER: Let them say whether they would admit that there is such a thing as a mortal animal.

THEAETETUS: Of course they would.

STRANGER: And do they not acknowledge this to be a body having a soul?

THEAETETUS: Certainly they do.

STRANGER: Meaning to say that the soul is something which exists?

THEAETETUS: True.

STRANGER: And do they not say that one soul is just, and another unjust, and that one soul is wise, and another foolish?

THEAETETUS: Certainly.

STRANGER: And that the just and wise soul becomes just and wise by the possession of justice and wisdom, and the opposite under opposite circumstances?

THEAETETUS: Yes, they do.

STRANGER: But surely that which may be present or may be absent will be admitted by them to exist?

THEAETETUS: Certainly.

STRANGER: And, allowing that justice, wisdom, the other virtues, and their opposites exist, as well as a soul in which they inhere, do they affirm any of them to be visible and tangible, or are they all invisible?

THEAETETUS: They would say that hardly any of them are visible.

STRANGER: And would they say that they are corporeal?

THEAETETUS: They would distinguish: the soul would be said by them to have a body; but as to the other qualities of justice, wisdom, and the like, about which you asked, they would not venture either to deny their existence, or to maintain that they were all corporeal.

STRANGER: Verily, Theaetetus, I perceive a great improvement in them; the real aborigines, children of the dragon's teeth, would have been deterred by no shame at all, but would have obstinately asserted that nothing is which they are not able to squeeze in their hands.

THEAETETUS: That is pretty much their notion.

STRANGER: Let us push the question; for if they will admit that any, even the smallest particle of being, is incorporeal, it is enough; they must then say what that nature is which is common to both the corporeal and incorporeal, and which they have in their mind's eye when they say of both of them that they 'are.' Perhaps they may be in a difficulty; and if this is the case, there is a possibility that they may accept a notion of ours respecting the nature of being, having nothing of their own to offer.

THEAETETUS: What is the notion? Tell me, and we shall soon see.

STRANGER: My notion would be, that anything which possesses any sort of power to affect another, or to be affected by another, if only for a single moment, however trifling the cause and however slight the effect, has real existence; and I hold that the definition of being is simply power.

THEAETETUS: They accept your suggestion, having nothing better of their own to offer.

STRANGER: Very good; perhaps we, as well as they, may one day change our minds; but, for the present, this may be regarded as the understanding which is established with them.

THEAETETUS: Agreed.

STRANGER: Let us now go to the friends of ideas; of their opinions, too, you shall be the interpreter.

THEAETETUS: I will.

STRANGER: To them we say—You would distinguish essence from generation?

THEAETETUS: 'Yes,' they reply.

STRANGER: And you would allow that we participate in generation with the body, and through perception, but we participate with the soul through thought in true essence; and essence you would affirm to be always the same and immutable, whereas generation or becoming varies?

THEAETETUS: Yes; that is what we should affirm.

STRANGER: Well, fair sirs, we say to them, what is this participation, which you assert of both? Do you agree with our recent definition?

THEAETETUS: What definition?

STRANGER: We said that being was an active or passive energy, arising out of a certain power which proceeds from elements meeting with one another. Perhaps your ears, Theaetetus, may fail to catch their answer, which I recognize because I have been accustomed to hear it.

THEAETETUS: And what is their answer?

STRANGER: They deny the truth of what we were just now saying to the aborigines about existence.

THEAETETUS: What was that?

STRANGER: Any power of doing or suffering in a degree however slight was held by us to be a sufficient definition of being?

THEAETETUS: True.

STRANGER: They deny this, and say that the power of doing or suffering is confined to becoming, and that neither power is applicable to being.

THEAETETUS: And is there not some truth in what they say?

STRANGER: Yes; but our reply will be, that we want to ascertain from them more distinctly, whether they further admit that the soul knows, and that being or essence is known.

THEAETETUS: There can be no doubt that they say so.

STRANGER: And is knowing and being known doing or suffering, or both, or is the one doing and the other suffering, or has neither any share in either?

THEAETETUS: Clearly, neither has any share in either; for if they say anything else, they will contradict themselves.

STRANGER: I understand; but they will allow that if to know is active, then, of course, to be known is passive. And on this view being, in so far as it is known, is acted upon by knowledge, and is therefore in motion; for that which is in a state of rest cannot be acted upon, as we affirm.

THEAETETUS: True.

STRANGER: And, O heavens, can we ever be made to believe that motion and life and soul and mind are not present with perfect being? Can we imagine that being is devoid of life and mind, and exists in awful unmeaningness an everlasting fixture?

THEAETETUS: That would be a dreadful thing to admit, Stranger.

STRANGER: But shall we say that has mind and not life?

THEAETETUS: How is that possible?

STRANGER: Or shall we say that both inhere in perfect being, but that it has no soul which contains them?

THEAETETUS: And in what other way can it contain them?

STRANGER: Or that being has mind and life and soul, but although endowed with soul remains absolutely unmoved?

THEAETETUS: All three suppositions appear to me to be irrational.

STRANGER: Under being, then, we must include motion, and that which is moved.

THEAETETUS: Certainly.

STRANGER: Then, Theaetetus, our inference is, that if there is no motion, neither is there any mind anywhere, or about anything or belonging to any one.

THEAETETUS: Quite true.

STRANGER: And yet this equally follows, if we grant that all things are in motion—upon this view too mind has no existence.