The Heart of God.

"And the LORD God planted a garden eastward in Eden; and there he put the man whom he had formed." (Gen 2:8). 

< Comparing spiritual with physical.>

1- A New Creature.
Whenever someone become born-again, he or she receives or is given a new heart, and this heart is the Heart of God. The garden God planted for the man He created and formed is synonymous with the "new heart" at recreation or redemption...

"Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new." (2 Co 5:17).

To be born again means to be spiritually created anew. YOU ARE NOW A NEW CREATURE BIRTH THROUGH THE SHEDDING OF THE BLOOD AND WATER OF CHRIST. Your bloodline is different from that of the world. You are now a child of God and His Christ! Your identity has changed by virtue of your Father in heaven, and this is what you must manifest, that you are now the son or daughter of God.

2- The Garden.
In the beginning, the garden is where God placed everyone in Adam, and so it is with being spiritually born again into God's garden or Heart, i.e, the new heart you've received. Your new heart is the Heart of God. Everything done through this Heart, is very pleasing to the Father. King David was a man after God's own heart, a man after the Spirit of God, and it made a huge difference between him and king Saul. They both received the same heart, but only king David dressed and kept his. Here's a summary account given in the book of 1 Samuel 13:13-14: 
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(13) "And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of the LORD thy God, which he commanded thee: for now would the LORD have established thy kingdom upon Israel for ever.
(14) But now thy kingdom shall not continue: the LORD hath sought him a man after his own heart, and the LORD hath commanded him to be captain over his people, because thou hast not kept that which the LORD commanded thee." 
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3- The Purpose.
The placement of Adam within the garden is to provide for all his needs to have total dominion over the whole earth. The was the "white house" of the whole world, providing for everything Adam might need. Here are just two out of the everything the garden stood for: 

a- Provision:
"And out of the ground made the LORD God to grow every tree that is pleasant to the sight, and good for food; the tree of life also in the midst of the garden,and the tree of knowledge of good and evil." (Gen 2:9) Note that in the new man's heart, there is no more the tree of knowledge of good and evil. You don't balance things with good and evil, but good.

b- Safety:
"He that dwelleth in the secret place of the most High shall abide under the shadow of the Almighty." (Psa 91:1). The Heart is the garden of God, and a secret place of safety. Please note that nobody plants a vineyard without a wall of protection or hedge around it, (Mark 12:1).

"Apply thine heart unto instruction, and thine ears to the words of knowledge." (Prov 23:12). When you keep the Word of God deep in your heart, it will guide you and keep you from harm. This is what wisdom is for, (Read Prov 1).

In conclusion, dress and keep your heart very dearly, and make no room for the devil. Never forget this - the Heart of God is now your heart. Worship God in your heart always, for it is what our Father is seeking, (John 4:24). God's interest is all about the heart, therefore...

"Keep thy heart with all diligence; for out of it are the issues of life." (Prov 4:23).