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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 Eurystheus1 to bring the cattle from Erytheia2 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;
1 Eurystheus, king of Mycenae, imposed the twelve labors upon Heracles; see Isoc. 4.56 and note.