Symbols: Tree with Fruit or Apple
The parents of the human race, Adam and Eve, disobeyed God's command in the Garden of Eden, thereby commiting the original sin, resulting in the closing of the gates of Heaven to mankind.
Even after this sin, man was not abandoned by God. God promises a Messiah and Redeemer: "I will put emnity between thee and the woman, and thy seed and her seed: she shall crush thy head, and thou shalt lie in wait for her heel (Gen 3:14)." He tells us of a "New Adam" who will have victory over sin.
This victory of Christ has given us greater blessings than those which sin had taken from us. God permits evil in order to draw forth some greater good: "O Happy Fault, whereby we have merited so great a Redeemer (Exsultet)."
Recommended Readings: Genesis 3:1-7, 9, 14-29, 23-24