“It is by the spirit of the teachings of both Buddha and Pythagoras, that we can so easily recognize the identity of their doctrines. The all-pervading universal soul, the Anima Mundi, is Nirvana; and Buddha, as a generic name, is the anthropomorphized monad of Pythagoras.
When resting in Nirvana, the final bliss, Buddha is the silent monad, dwelling in darkness and silence; he is also the formless Brahm, the sublime but unknowable Deity, which pervades invisibly the whole universe.
Whenever it is manifested, desiring to impress itself upon humanity in a shape intelligent to our intellect, whether we call it an avatar, or a King Messiah, or a permutation of Divine Spirit, Logos, Christos, it is all one and the same thing. In each case it is “the Father”, who is in the Son, and the Son in “the Father”.
The immortal spirit overshadows the mortal man. It enters into him, and pervading his whole being, makes of him a god, who descends into his earthly tabernacle. Every man may become a Buddha, says the doctrine.
And so throughout the interminable series of ages we find now and then men who more or less succeed in uniting themselves “with God”, as the expression goes, with their own spirit, as we ought to translate.
The Buddhist call such men Arhat. An Arhat is next to a Buddha, and none is equal to him either in infused science, or miraculous powers. Certain fakirs demonstrate the theory well in practice, as Jacolliot has proved.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 