The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Sophist by Plato: classes about and in the sphere of which we proposed to make enquiry?
THEAETETUS: Surely we cannot admit that the number is less than it
appeared to be just now.
STRANGER: Then we may without fear contend that motion is other than
being?
THEAETETUS: Without the least fear.
STRANGER: The plain result is that motion, since it partakes of being,
really is and also is not?
THEAETETUS: Nothing can be plainer.
STRANGER: Then not-being necessarily exists in the case of motion and of
every class; for the nature of the other entering into them all, makes each
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