Rebirth Is Determined by the Karma or Vow Power of the Manas.

The tathāgatagarbha never acts as a master; He does not think about going to be conceived in a womb. It is always the manas that decides to enter the womb, and only then does the tathāgatagarbha cooperate with the manas to enter the womb. When the manas decides to take rebirth, it takes rebirth entirely in accordance with the karmic force of its habitual tendencies, or in accordance with the power of vows; at that point it depends on whether the karmic force or the power of vows is stronger. If the manas has not eradicated the view of self (satkāya-dṛṣṭi) and has not severed the three fetters, its karmic force is still very great, and it cannot avoid going to the three evil destinies; most go to the ghost destiny, because one hundred percent of people have greed that is not light. With greed, one must go to the ghost destiny; when the karma of the ghost destiny is exhausted, one is reborn in the animal destiny; and when the karmic conditions of the animal destiny end, one returns to the human world to be a person.

Therefore, eradicating the view of self (satkāya-dṛṣṭi-prahāṇa) and seeing the mind and one's nature—indeed, realizing any dharma whatsoever—is always accomplished jointly by the mind consciousness and the manas. If the manas does not realize it, the bonds of birth and death in the three evil destinies will impel the manas to be reborn in the three evil destinies, and then there will be the five-aggregate body and the six consciousnesses of the three evil destinies for the manas to make use of. Such a five-aggregate body and six consciousnesses differ greatly from the five-aggregate body and six consciousnesses of a human, because the karmic forces are different. As for the matter of taking rebirth, the mind consciousness is completely powerless; at the time of conception the mind consciousness has ceased and can no longer serve as an advisor to the manas. The manas decides entirely on its own, which is equivalent to karmic force deciding entirely. So if the manas has not eradicated the view of self and has not seen the mind, how could it be liberated from the karma of birth and death?