This woman seems hopelessly carnal. She can't see beyond her physical senses. But Jesus aims to make her a worshiper of God in spirit and truth. The quickest way to the heart is through a wound. Concealed sin keeps us from seeing the light of Christ.
Sin is like spiritual leprosy.
It deadens your senses so you rip your soul to shreds and don't even feel it. But Christ has set his sights on this woman's conversion. So he lays bare her spiritual leprosy. You've had five husbands and the man you're sleeping with now is not your husband. Now watch the universal reflex of a person trying to avoid conviction.