Every student of Plato will be inclined to admit that, among his dialogues, the Parmenides is one of the hardest to understand. The attempt to elucidate it has continued since ancient times, but even to-day we still lack a definitive interpretation. The first part of the dialogue is relatively simple; it is with the second that the great difficulty begins. Two questions are raised: firstly, how this part is to be understood, and, secondly, how it is related to the first (...) part. (shrink)

In a paper where we tried to show in how many different meanings the term is chiefly used in the philosophy of Aristotle, we discussed the relation between and , but neglected the relation between and , which seems to be yet more important. The neglect, however, was purposeful; for to answer the question what the latter relation is requires a special research. This we are now going to carry out.