This is also why Siddharta rejected the notion that the arupa jhanas connected to the realm of nothingness and the realm of neither perception nor non-perception (as taught to him by two of his teachers before he attained enlightenment) provided the final release from dukkha. There was still something disturbing about these states, which correspond to the experiences of arupa Brahmas in the two highest, most sublime and blissful realms of existence.
A Quest to Recover Buddha's True Teachings