"The Diamond Sutra (Chin-Kang-Ching) or Prajna-Paramita" by Unknown is a Mahayana Buddhist sutra composed between the 2nd and 5th centuries. This influential text presents Buddha's discourse with the monk Subhuti, exploring profound themes of non-self, the emptiness of all phenomena, and liberation without attachment. The work's title invokes the vajra—diamond or thunderbolt—as a metaphor for wisdom that shatters illusions to reveal ultimate reality. Particularly prominent in Chan and Zen traditions, this sutra has inspired countless commentaries and devotional practices across East Asia.