Zen personal trouble or crisis. Though Zen-narrative states that it is a "special transmission outside scriptures" which "did not stand upon words", Zen does have a rich doctrinal background, which is firmly grounded in the Buddhist tradition. It was thoroughly influenced by the Chinese understanding of Yogacara and the Buddha-nature doctrine, Zen integrates both Yogacara and Madhyamaka and the influence of Madhyamaka can be discerned in the stress on non-conceptual insight and the paradoxical language of the koans. Most essential are "the most fundamental teaching that we are already originally enlightened", and the Bodhisattva ideal, which supplements insight with Karuṇā, compassion
History of Buddhism the Chinese monk Xuanzang traveled to India, bringing back 657 Buddhist texts along with relics and statues. He established a famed translation school in the Tang capital of Chang'an (today's Xi'an), focusing on Yogacara school texts. Also during the Tang, Chinese Esoteric Buddhism was introduced from India. The Tang dynasty also saw the growth of Chan Buddhism (Zen), with the great Zen masters such as Mazu Daoyi and Linji Yixuan. In the later Tang, Chinese Buddhism suffered a setback during the Great Anti-Buddhist Persecution of 845. Buddhism recovered during the Song Dynasty (960–1279), which is known as the "golden age"