"A large number of men have attained the Adept level—men not of one nation, but of all the leading nations of the world—rare souls who with indomitable courage have stormed the fortresses of nature, and captured her innermost secrets, and so have truly earned the right to be called Adepts. Among Them there are many degrees and many lines of activity; but always some of Them remain within touch of our earth as members of this Hierarchy which has in charge the administration of the affairs of our world and of the spiritual evolution of our humanity."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)