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.
The Heart Sutra
I have greatly benefitted by the wisdom of esoteric Buddhadharma encapsulated within the pages if this book. It is the best rendition of the heart sutra I have personally come across...because of the body of its text -abundant with meticulous detail.
However, in view of future readers, I recommend that the typos or formatting errors seen throughout its pages are fixed!
Nelunika Gunawardena Rajapakse