The Prajna Paramita Hrdaya Sutra is the core of The Mahaprajna Paramita Sutra in six hundred scrolls. Its teaching is the teaching of supramundane Voidness as the only true existence, the true Void being mysteriously concealed in the existing. Therefore, one might say the substance of this sutra is the Voidness of all dharmas; and non-obtaining is the purpose.
