Mahāprajñāpāramitā sūtra

Maha Prajnaparamita Sutra – Tangut Manuscript

The Buddha: Without mark is this perfection of wisdom. Just as the element of space and the element of air cannot be approached by the mark of the total reality of any dharma, just so the perfection of wisdom.
The Questions of Suvikrantavikramin. Perfect Wisdom: The Short Prajnaparamita.