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It came to pass that Heracles undertook perilous labors more celebrated and more severe, Theseus those more useful, and to the Greeks of more vital importance. For example, Heracles was ordered by EurystheusEurystheus, king of Mycenae, imposed the twelve labors upon Heracles; see Isoc. 4.56 and note. to bring the cattle from ErytheiaAn island near the coast of Spain. and to obtain the apples of the Hesperides and to fetch Cerberus up from Hades and to perform other labors of that kind, labors which would bring no benefit to mankind, but only danger to himself;
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Theseus, however, being his own master, gave preference to those struggles which would make him a benefactor of either the Greeks at large or of his native land. Thus, the bull let loose by Poseidon which was ravaging the land of Attica, a beast which all men lacked the courage to confront, Theseus singlehanded subdued, and set free the inhabitants of the city from great fear and anxiety.
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And after this, allying himself with the Lapiths, he took the field against the Centaurs, those creatures of double nature, endowed with surpassing swiftness, strength, and daring, who were sacking, or about to sack, or were threatening, one city after another. These he conquered in battle and straightway put an end to their insolence, and not long thereafter he caused their race to disappear from the sight of men.