Guardian of the Cause of God is its sacred head and the distinguished member for life of that body.
Unto this body all things must be referred. It enacteth all ordinances and regulations that are not to be found in the explicit Holy Text. By this body all the difficult problems are to be resolved and the guardian of the Cause of God is its sacred head and the distinguished member for life of that body. Should he not attend in person its deliberations, he must appoint one to represent him. Should any of the members commit a sin, injurious to the common weal, the guardian of the Cause of God hath at his own discretion the right to expel him,..
- Will and Testament of Abdul Baha, page 14