Answer:
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His purpose in delivering the sermon is to warn his congregation in particular, and presumably, by extension, his nation as a whole, that they must repent of their sinful ways and turn to God for forgiveness before it is too late.
He wrote the Theogony, a hexametric poem on the genealogies of the gods, and Works and Days, which gave moral and practical advice and was the chief model for later ancient didactic poetry.
