"Esoterically an adept is not a Master of Wisdom until He has achieved the fifth initiation or, in other words, until He has entered the spiritual plane and His consciousness embraces the fifth or spiritual kingdom. The Masters are members of that group of 'Illumined Minds' which is guided by love and understanding, and by deep compassion and inclusiveness towards humanity. They are striving towards a comprehension and translation of the Divine Purpose, and are illumined by knowledge of the Plan; they are also characterized by a readiness to sacrifice their own immediate spiritual progress if thereby they can assist humanity in its upward struggle."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)