Master

Also known as Adepts, Mahatmas, or simply "Brothers", the Masters are ...

Renouncing Nirvana

H. P. Blavatsky wrote about:

. . .the hitherto very esoteric doctrine of the Nirmanakayas was lately brought forward as a proof and explained in the treatise called The Voice of the Silence. These Nirmanakayas are the Bodhisattvas or late Adepts, who having reached Nirvana and liberation from rebirth, renounce it voluntarily in order to remain invisibly amidst the world to help poor ignorant Humanity within the lines permitted by Karma.