Where is the heart (mentioned almost 1,000 times in the Bible)—from where LIFE/rivers of living water should flow in born-again believers?
This is the area that God wants us to keep especially clean—very pretty—pure—so His love can flow!
It’s lower than we think, I think. But may also include the actual heart, which is more than a pump.
This has many ramifications. One of which is achieving real freedom—deep within! And could healing waters come from here too?
I think this may be the source of the love of Jesus within us.  May we learn to flow in it.
Let us be ONE! : )
Consider John 7:38, literally:

<< John 7:38 >>

International Standard Version (©2008)

The one who believes in me, as the Scripture has said, will have rivers of living water flowing from his heart.”

New American Standard Bible (©1995)
“He who believes in Me, as the Scripture said, ‘From his innermost being will flow rivers of living water.'”

GOD’S WORD® Translation (©1995)
As Scripture says, ‘Streams of living water will flow from deep within the person who believes in me.'”

King James Bible
He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

American King James Version
He that believes on me, as the scripture has said, out of his belly shall flow rivers of living water.

Douay-Rheims Bible
He that believeth in me, as the scripture saith, Out of his belly shall flow rivers of living water.

Darby Bible Translation
He that believes on me, as the scripture has said, out of his belly shall flow rivers of living water.

English Revised Version
He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

Webster’s Bible Translation
He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

World English Bible
He who believes in me, as the Scripture has said, from within him will flow rivers of living water.”

Young’s Literal Translation
he who is believing in me, according as the Writing said, Rivers out of his belly shall flow of living water;’
Source
See especially: Can we really transplant a human soul?
All of my heart, soul, mind, gut? posts at OneCanHappen
All of my heart, soul, mind, gut? posts at ToBeFree