physical water to "living water" — water that springs up to eternal life — and then to the most direct messianic disclosure in the Book of Signs.
When the woman raises the question of the right mountain for worship, Jesus's answer is striking: "The hour is coming, and is now here, when the true worshipers will worship the Father in spirit and truth" (4:23). Neither Gerizim nor Jerusalem has a permanent franchise. The location of true worship is not a mountain — it is relationship with the Father in the medium of Spirit.
What the original audience would have understood is the weight of the ethnic-religious stakes: Samaritans and Jews shared a heritage of conflict over precisely this question of legitimate worship sites. Jesus's answer is not a diplomatic compromise. It announces the obsolescence of the entire territorial framework for accessing God's presence.
The doxa available through the agent's mission is not geographically restricted. The climax is the woman's observation — "I know that Messiah is coming" — and Jesus's response: "I who speak to you am he" (ego eimi) (4:25-26). This is one of the predicate-ego eimi forms (not the absolute construction of chapter 8), but the disclosure is striking: the most direct messianic self-identification in the Book of Signs happens in conversation with a Samaritan woman at a well at noon.
Martinus de Boer (Johannine Perspectives on the Death of Jesus, Peeters, 1996, p. 47) and Brown both note the theological provocation in this — the woman becomes the first person in John to receive a direct messianic disclosure, and she immediately becomes a witness to her community.