Jesus spoke these words in a loud voice in Jerusalem during the Feast of Tabernacles. At that time, very few, or maybe none of the people understood what He was saying. Before entering the temple the Jews washed their hands in a mikveh, a basin filled with freshly flowing water.
Some believe that Jesus was speaking of the Holy Spirit when He said that living waters would flow from them. I don't argue with them, but I do offer another possibility. There is a freshness, both perceived and actual, in water that flows. It is neither still nor stagnant, but moving, washing away what was the old and bringing in the fresh. Might Jesus have been referring to the message He brought, forgiveness of sin through belief in Him rather than the law as given by Moses? This fresh and new means of salvation moves by being passed on through the speech and testimony of those who accept Jesus as Messiah. We are commanded to let this water flow through us and out of us through the Great Commission Jesus gave us in Matthew 28:19: "Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit." (NIV) Lord, may the living water of your salvation flow through me and from me today.
Living Water: Firehole River, Yellowstone
"Whoever believes in me, as Scripture has said, rivers of living water shall flow from within them." (NIV)