Discipline. These are some of my favorite definitions.
Self-control. Training that corrects and molds the mental faculties or moral character.
To train by instruction and exercise. To punish or penalize.
In order to train and correct. Control and chastise.
To train by instruction and exercise. To punish or penalize. In order to train and correct. Control and chastise.
An instrument of punishment,
like a whip used in the practice of self-mortification,
or an instrument of chastisement.