God planted a garden in Eden

God planted a garden in Eden 

God spoke everything into existence, but the garden God planted, so there must be something of great significance if the Lord God has taken time to plant a garden,  Eden is a place of plentiful and abundance and the Lord God placed man in the garden.  

In the Gods Code of Business Book by Ronald Nair, we look at the garden and its meaning and the rivers which flowed through the garden and became four river heads. What was the purpose and meaning of the rivers Pishon,  Gihon, Tigris, and the Euphrates?