Chandragarbha Prajnaparamita, is yet another short Prajnaparamita Text, which summarizes the entire Prajnaparamita into a Mantra. In this Sutra, Bodhisattva Chandragarbha inquires the Bhagavan, on how Bodhisattvas should train themselves in Prajnaparamita.

The Bhagavan replies:

The fact, Candragarbha, that all dharmas are devoid of existence, that is the perfection of wisdom i.e Just as the disk of the moon indiscriminately turns round the four Continents and removes the darkness, just so the Bodhisattva, the great being, coursing in the the perfection of wisom, indiscriminately move round the four perverted view with his compassion, remove the defilements in the very core of their essential nature, and that by way of non-discrimination

The Sutra then goes on with explaining, the Prajnaparamita of the Bodhisattva. The Bhagavan then declares:

Therefore then, the perfection of wisdom is a Mantra:

oṁ prajñe prajñe mahāprajñe candraprajñe sarvaśā sagari svāhā

The variant reading yields:

oṁ prajñe prajñe mahāprajñe candraprajñe sarvaśāsa kari svāhā

Note the term "Candraprajña" (Moon-Wisdom) appearing in the Mantra. It is reminding of the fact that, the Bodhisattva should be like a Moon, indiscriminate in nature as said above. The name of the Bodhisattva, "Candragarbha" also sounds more metaphorical. The whole discourse in essence seems to be a means to reiterate the Indiscriminate nature of the Bodhisattva, for which Moon serves as a metaphor.

References

1. Conze's Translation of the "The Perfection of Wisdom for Candragarbha" from "Perfect Wisdom - The Short Prajnaparamita Texts"