Her heart is his to caress. She becomes his possession. The Master does not take away the fledglings identity, but allows her to grow into her own being, her own likeness, her submission to him is not a vehicle of punishment or hatred, but one of love and development. She is given the room to come into her own, under her Master's care, like a flower that flourished under the sun's warmth. She radiates from his love and devotion.
Punishment is handed out lovingly yet firmly.
The Master is not angry, there is no place for anger with punishment. The Master is teaching. Punishment and discipline need not be physical, it can be psychological. It is not done out of harshness or hostility, it is done out of love and forgiveness. In conclusion, I believe a Master does not mold a sub into what he feels she should be, but allows her the freedom to live and grow under his loving care.