a spring: a natural source of water rising from the ground, and by extension the source from which something flows
The word names a spring: water that rises on its own from the ground, alive and moving, as opposed to a dug well or cistern that has to be hauled from with a bucket. That single picture holds every use together. Even when a writer stretches the word past literal water, the image of a source that something flows out of stays intact.
Most occurrences describe an actual spring, whether a real place (the spring at Jacob's ground where Jesus met the Samaritan woman) or the created springs of water in Revelation that God made and that judgment later spoils. From there the word carries a heavier freight. Jesus promises a spring welling up inside a person all the way to eternal life, and Revelation ends with a free drink from the spring of the water of life. This is the Bible's settled image for the life God gives.
The word can also point simply to the source of something, the place it issues from, without a literal pool of water in view. Mark uses it for the bodily source of a woman's bleeding, and other writers apply it to people, calling false teachers dry springs that promise water and give none. In every case the core idea is the same: the point from which something flows.
Nuances
What the spring of living water welling up inside the believer (John 4:14) refers to.
- majorityThe Holy Spirit given to the believer, following the Evangelist's own explanation of living water as the Spirit in John 7:39.; Raymond E. Brown, The Gospel According to John I-XII, AB 29 (Doubleday, 1966); Craig S. Keener, The Gospel of John (Hendrickson, 2003)
- minorityThe word of revelation that Jesus brings, received from outside yet kept as a permanent inner possession.; Rudolf Bultmann, The Gospel of John: A Commentary (Westminster, 1971)
- minorityWisdom, or a deliberate fusion of Old Testament symbols (Spirit, Wisdom, Torah, life) that resists reduction to a single referent.; Ben Witherington III, John's Wisdom (Westminster John Knox, 1995); Francis J. Moloney, The Gospel of John, Sacra Pagina (Liturgical Press, 1998)