When Adam chose to disobey God, he essentially removed God's standard and made one of his own. As a result, God's paradise became a place of pain, suffering, and death. If this were the end of the story it would be tragic indeed, but a promise was given by God. It was the promise of a redeemer. God foretold of a descendant of the woman who would deliver a crushing blow to the serpent and defeat him. We know of this redeemer as Christ the Son of God. His mission to redeem man led Him to the cruel cross of Calvary. Thus we have two very important periods of man's history, Eden and Calvary.
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