John 4: 16 Jesus saith unto her, Go, call thy husband, and come hither. 17 The woman answered and said, I have no husband. Jesus said unto her, Thou hast well said, I have no husband: 18 For thou hast had five husbands; and he whom thou now hast is not thy husband: in that saidst thou truly. 19 The woman saith unto him, Sir, I perceive that thou art a prophet.
This has always seemed strange to me. We see this kind of thing happen frequently in mystery stories and the person always asks how do you know me and wonders who this person is that has been spying on them. Never once in all the stories I have read or heard does the person say "I perceive thou art a prophet", except this one. So consider the story, she comes to get water when no one else will come because she is an outcast, a "deplorable" person that none of the other women want to associate with. Everything about her suggests that she feels unloved and that no one cares for her. So of course no one would bother to be spying on her, she assumes Jesus knows this, not because He cares for her but because He is a prophet.
But later she tells the villagers "come see a man that told me all things ever I did". I heard a story from Henry Gruver, he was killed in a car crash, went to heaven and then had a miraculous healing right there on the side of the road so that he didn't even need an ambulance or a doctor. It was quite amazing. But later the Lord reminded him of something he prayed about as a small boy. He had crawled under a truck so no one would see him and prayed to see when the God rolled up the heavens as a scroll. Jesus told him he had taken him to heaven so that he could see it first before it was rolled up. So forty or fifty years later Jesus still remembers that prayer and is going to make sure he answers that prayer and in fact is going to do more than Henry had asked or thought. But the miraculous healing came as his children and wife prayed, so his death and healing helped strengthen all his family. His fourteen year old son later said that it is a good thing that since their mother doesn't know how to drive a car (she is the one who was driving when the car accident happened) that she does know how to pray.
Knowing that someone has had five husbands is not going to impress me all that much, but knowing about a prayer someone made from underneath a truck forty years earlier, that would be proof that they are hearing from God.