John Milton's "Paradise Lost" talks about Gods first creations, Adam and Eve, and how their lives in heaven are affected by the two sides, Angels and Demons, described in the poem. The two humans have been given strict instructions by their creator to not eat from the Tree of Knowledge but even so they are tricked by a transformed Devil, Satan, and end up disobeying God's will. As their punishment they are sent to Earth where they have to learn how to make a living on their own and soon enough find themselves regretting what they had done and praying to God for forgivness. Seeing this, God decides to show mercy upon these lost souls and welcomes them back into His kingdom.
