The myriad Nirmanakaya

Chapter V
Discourse on the Three-Bodies of Buddha

Now, what is the Myriad Nirmanakaya? When we subject ourselves to the least differentiation or particularisation, transformation takes place: otherwise all things would be as void as space, as they inherently are. By letting our minds dwell on evil things, hell arises. By letting our minds dwell upon good acts, paradise is manifested. Dragons and snakes are the transformations of venomous hatred; while Bodhisattvas are compassionate thoughts made manifest.

The various heavens are the projection of Prajna; while underworlds are the transformations of ignorance and infatuation. Un-numbered, indeed, are the transformations of Mind-essence. People under delusion are as if asleep; they do not understand; their minds naturally turn toward evil and, as a rule, they practice evil. But should they turn their minds from evil to righteousness, even for one moment, Prajna shines forth. This is what is called the Nirmanakaya of the Buddha of Mind-essence. ~ Sutra of the Sixth Patriarch

Source:
www.sacred-texts.com/bud/bb/bb30.htm