Discipline...... Making the punishment fit the crime or is it?

I have been dwelling on thoughts of disciplne to apply to my shi.
Discipline is a huge topic, and its not always what we think. It comes in many forms and selecting the appropriate one to fit the required result is a skill that is aquired through practice and observation of the effect. Let me try to expand.
There is a saying "Let the punishment fit the crime". Punishment is just one form of discipline, focused on physical pain, supposed to leave a long lasting impression on the receipient. However, physical punishment is not always that in the BDSM world, it is pleasure to a masochist. There lies the dilema.
Discipline is a training tool to achive a change in behaviour that is long lasting or permenant, and it comes in many forms, of which inflicted pain is one. For disciplne to be effective as a method of training, it should leave a lasting impression on the mind. Its the mind that controls everything we do, or think. Therefore when dealing with a slave, especially one with a high masochistic drive, selecting the right method of discipline and the level at which its is applied is an aquired skill, and it is deeply personal between the trainer and trainee in slavery BDSM. It is the exertion of dominance over a slave's mind that is their Masters chief objective.
It would be true to say that disciple and reward may be the most powerful training tool of all. Hence, whipping a pain slut serves the dual purpose of inflicting memorable pain, which they process as pleasure and hence as a reward. It therefore follows that correctly applied, pain is a powerful discipline tool in BDSM because it delivers the double whammy of pleasure and pain to a masochist, something that is more powerful than a bell to Pavlov's dog.