The Diamond is part a large canon of early Mahayana sutras called the Prajnaparamita Sutras. Prajnaparamita means "perfection of wisdom." In Mahayana Buddhism, the perfection of wisdom is the realization or direct experience of sunyata (emptiness). The Heart Sutra also is one of the Prajnaparamita Sutras. Sometimes these sutras are referred to as the "prajna" or "wisdom" literature.
This product is kind of donation, will not be listed in invoice. We can provide receipt if needed.