My study is an investigation of the "tradition" of Greek poetry in two senses. First, words have meaning, and they are much better understood if this fact is firmly recognized and a given concept is seen in its historical development. Sophistry is a recurrent human temptation. Secondly, the body of poetry from Homer to Euripides forms an organic whole, not only because a Greek poet, in spite of the emergence of new poetic genres, always felt the impact of his predecessors, but also because, with the death of tragedy, something entirely new arose in Greek letters: philosophy and oratory. My decision to limit my investigation of ATH much by the realization that such an organic whole provided an adequate body of literature to delineate the boundaries of a serious investigation as by the fact that, with a rare exception (Herodotus I.32), ATH is a word not used in Greek prose.