In the Garden of Eden Adam & Eve experienced harmony: with God; with one's self; with one another; and, with the rest of creation. This harmony is based on "The Word of God."
There were 2 trees in the middle of the Garden of Eden (the tree of Life
& the tree of the Knowledge of good & evil—Genesis 2:9b); “You
are free to eat from any tree in the garden; but you must not eat from the tree
of the knowledge of good & evil…” (Genesis 2:16b-17a.)
The Harmonious Life God created for us depends upon obeying God's Word.
Also see the Leaders Guide to The Executive Overview of the Bible: The Tree of Life & Take Care of the Earth. Addendum December 2011.