"The Masters are those beings who, by sore travail of soul, by vast experience, suffering, and sacrifice, have advanced to a degree of evolution far beyond ordinary human beings. Their consciousness is not limited to any one plane of life, as is the case with ordinary men and women. A Master is one who has conquered the limitations of matter, as that term is usually under stood, and is able to function consciously and at will on more than; one plane of being, according to the degree to which he has attained. In other words, a Master is one who has entered the Eye of the' Triangle in the Square, and who henceforth functions in wider spheres', of action, where he becomes and IS a conscious factor, force, and agent in helping on the evolution of worlds and races."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)