The manas is the driving force behind the manifestation of all dharmas in the three realms of existence.

The manas impels the tathāgatagarbha to produce the material universe (the inanimate world), and it is also karmic seeds that impel the tathāgatagarbha to bring forth the material universe. The manas corresponds with karmic seeds, and the manas thus represents karma—whether wholesome karma, unwholesome karma, or karma that is neither wholesome nor unwholesome.

The birth of the material universe is a preparation for the birth and survival of the five aggregates, and it is also conditioned existence within the three realms. Because of karmic seeds, when karmic conditions ripen, they impel the tathāgatagarbha to output the seeds of the four great elements, forming the four great elements. The tathāgatagarbhas of all sentient beings jointly transform and construct the material universe; only after it is constructed can sentient beings be born. The purposiveness lies with the manas. If the manas has no purpose, the karma of the three realms' world ceases, and—like an arhat—one enters nirvāṇa without remainder, and thus the three realms also disappear. 

The dharma of the twelve links of dependent origination explains precisely this principle: when karmic causes and conditions ripen, sentient beings are born; without a material universe, there is no environment for survival, and the causes and conditions for sentient beings' birth are not yet ripe. This condition is also brought about by the manas, for the manas is the driving force behind the arising of all dharmas in the world of the three realms.