gregkavarnos wrote:And let's not forget the Heart Sutra.
It is tantra.
Is it or isn't it? Only a high Bodhisattva can tell for sure (riffing off an old Clarol commercial).
Lopez essentially wrote a book discussing this, his excellent Heart Sutra book. From the perspective of literary criticism the Heart Sutra can be viewed as an intermediate text between sutras and tantras.
But then how should we classify the numerous dharani texts? Probably as texts developed there is not that great a leap from dharani texts to tantra in terms of outward form.
However many tantras look outwardly like books of magic and the Heart Sutra, while being really magical, doesn't have this characteristic.
Kirt's Tibetan Translation Notes
"Even if you practice only for an hour a day with faith and inspiration, good qualities will steadily increase. Regular practice makes it easy to transform your mind. From seeing only relative truth, you will eventually reach a profound certainty in the meaning of absolute truth."
Kyabje Dilgo Khyentse Rinpoche.
"Only you can make your mind beautiful."
HH Chetsang Rinpoche