The Pure River of Water of Life (Rev 22:1) - Symbolic Meaning and Eternal Life

In Rev 22:1, the Bible teaches that there is a pure river that comes out of the throne of God.  Also, this pure river is the water of life. But, what does this mean? And, why is this symbol used?  Why is the river pure? Finally, why is it called the water of life? This important symbol in the Bible points to the Holy Spirit as the eternal satisfying river that satisfies the thirst for righteousness in eternity. 

Please visit: http://www.TheRockofOffence.com for more information.

And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.  (Rev 22:1)
And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.  (Rev 21:6)
And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely.  (Rev 22:17)