Jesus said to her, “Everyone who drinks of this water will be thirsty again, but whoever drinks of the water that I will give him will never be thirsty again. The water that I will give him will become in him a spring of water welling up to eternal life.” John 4:13-14 (ESV)
There is no heart satisfaction in this world, until we believe on Christ. Jesus alone can fill up the empty places of our inward (soul). Jesus alone can give solid, lasting, enduring happiness. The peace that He imparts is a fountain, which, once set flowing within the soul, flows on to all eternity. Its waters may have their ebbing seasons; but they are living waters, and they shall never be completely dried.
Ryle, J. (1857) Expository Thoughts on the Gospels, Monergism Books, pg. 1459