  “Sticking into your neighbor's flesh (or, body)” is another way of referring to the suffering, misfortune, hardship, or pain of another person. When something, such as a needle, sticks into your own flesh or body, you feel the pain. If it stuck into another person's—your neighbor's—flesh, you would not directly feel the pain. Even so, you should not feel insensitive to the pain or suffering of that person and shrug off your moral shoulders, for the other person's body is certainly not a piece of wood that cannot feel pain.