The Buddha once said, "have no masters and be the master of none." To have no masters also means let nothing master you, including worldly goods. To be the master of others means to be above others.
A true teacher nurtures and teaches The Way, The Law and The Will of things and the consciousness through the heart. For all true hearts are as one, derived from the great heart of the creation. The one pulse, the one frequency, the one vibration - this is 'The Way'.
If you master all of this, then you are a master of yourself!