Part 1b.1i - How to comprehend the mind of the four formless dhyanas

The manner:

Therefore, even this, the mind of the formless dhyanas,
Is a fruit of past karma, with transmigration upon its exhaustion.
Because it is ignorance, its essence is merely neutral.
Because it produces errors of cause and effect in samsara
Again and again, we have a need to be free of it.

The Sutra on Being Without Suffering (mya ngan med pa’i mdo) says:

By the productive power of former collections of virtue,
Fine mansions of the celestial gods are reached and relinquished.
From the formless samadhis too, when their karma is exhausted,
Again one goes among those who are on or under the earth.