Why would one called the poem “Paradise Lost” an immortal creation?

Why would one called the poem “Paradise Lost” an immortal creation?
Paradise Lost starts with Milton depicting what he plans to embrace with his epic: the story of Man’s first rising and the loss of Eden subjects which have been fresh yet in rhyme. His fundamental goal, be that as it may, is to legitimize the methods for God to men. The ballad then moves to concentrate on the character of Satan who has quite recently tumbled from paradise.

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