How does a Master center a slave?

How does a Master center a slave? Being centered is a Zen term that means a person is balanced, calm, healthy, peaceful, grounded, and nourished. Some might see it as a relaxed state, one of calm, creative, full of the realization of being well-off, in communion with one's self and one's environment… How does a Master center a slave? He does it by creating, with His slave, a right relationship, that is, one in which each is free to be him or herself; one with openness, honesty, and clarity of purpose. Centering comes from having a clear focus, mutual support, encouragement, and purpose." -- Jack Rinella