The fourth and last of the Eleatic philosophers was Melissus, a native of
Samos. His date may be fixed as about 440 B.C. He took an active part in the
politics of his native country, and on one occasion was commander of the
Samian fleet in a victorious engagement with the Athenians, when Samos was
being besieged by Pericles. He belongs to the Eleatic school in respect of
doctrine and method, but we have no evidence of his ever having resided at
Elea, nor any reference to his connection with the philosophers there,
except the statement that he was a pupil of
Parmenides. He developed
very fully what is technically called in the science of Logic the Dilemma.
Thus, for example, he begins his treatise On Existence or On
Nature thus: “If nothing exists, then there is nothing for us to talk
about. But if there is such a thing as existence it must either come into
being or be ever-existing. If it come into being, it must come from the
existing or the non-existing. Now that anything which exists, above all,
that which is absolutely existent, should come from what is not, is
impossible. Nor can it come from that which is. For then it would be
already, and would not come into being. That which exists, therefore, comes
not into being; it must therefore be ever-existing.”