"When our great Buddha—the patron of all the adepts, the reformer and the codifier of the occult system, reached first Nirvana on earth, he became a Planetary Spirit; i.e.—his spirit could at one and the same time rove the interstellar spaces in full consciousness, and continue at will on Earth in his original and individual body. For the divine Self had so completely disfranchised itself from matter that it could create at will an inner substitute for itself, and leaving it in the human form for days, weeks, sometimes years, affect in no wise by the change either the vital principle or the physical mind of its body. By the way that is the highest form of adeptship man can hope for on our planet. But it is as rare as the Buddhas themselves, the last Khobilgan who reached it being Sang-Ko-Pa of Kokonor (XIV Century), the reformer of esoteric as well as of vulgar Lamaism."
January 1, 1970
https://en.wikiquote.org/wiki/Gautama_Buddha