What does John 4:10 mean?
One of the core principles involved in evangelism is the idea of "felt need." In short, a person can't act to correct a problem they don't know they have! Here, Jesus is introducing the woman to the fact that she has a spiritual thirst which needs to be satisfied. Later in the conversation, Jesus will be far more direct about the obvious sin and shame woven into this woman's lifestyle (John 4:16–18).John's presentation of this conversation reads like a summary, rather than a word-for-word transcript. Yet Jesus' reply is still odd. When a strange man asked her for a drink, all alone, she probably wondered what His intentions were. His answer was almost certainly not what the woman was expecting to hear. Remarkably, some of her answers during the rest of the conversation are pointed and witty, even sarcastic. Jesus' demeanor probably helped to ease her mind, even if she was still unsure of who He was, or what He was talking about.
Jesus will refer to the idea of "living water" again in this gospel (John 7:38–39). In both contexts the imagery suggests the Holy Spirit.