In Chapter 12 of The Scarlet Letter what brings Reverend Dimmesdale to the scaffold at night?

Reverend Dimmesdale goes to the scaffold at night to stand on the same spot where Hester Prynne stood seven years before. He is struggling with his guilt and inner torment, and the act symbolizes his inner conflict and sense of moral responsibility. It is a moment of private penance and reflection for him.