"Tara is a goddess, the feminine equivalent of the Arhat, or a Sister of the White Brotherhood. But please do not be too much interested in the names of various initiations; this will not lead you anywhere. In ancient times, each religio-philosophical school, or sacred brotherhood, had its own gradations or degrees, and had special names for them. But you may be sure that the true degrees were not designated by the names we now see in books. If you are interested in this, take the beautiful definitions of the degrees of spiritual advancement given in Agni Yoga. Indeed, among some who study occultism, there are those who are convinced that the Sun-initiation takes place on the physical sun! All degrees of initiation are in ourselves. When a disciple is ready, he receives a Ray of Illumination, which corresponds with the degree of purification he has achieved, as well as of the broadening of his consciousness and the fiery transmutation of his centers."
January 1, 1970
https://en.wikiquote.org/wiki/Initiation_(theosophy)