Sosan, also known as the Third Zen Patriarch, is a highly revered figure in Chinese Zen communities. His teachings and contributions to the development of Zen Buddhism continue to be celebrated and honored in modern times.

Sosan's influence can be traced back to the 7th century, during the Tang dynasty in China. He was a disciple of the Second Zen Patriarch, Huike, and is believed to have received the transmission of the Dharma directly from him. Sosan's teachings focused on the concept of "sudden enlightenment," which emphasizes the immediate realization of one's true nature rather than gradual cultivation.

One of the most significant ways in which Sosan is revered in modern Chinese Zen communities is through the practice of chanting his famous poem, "Hsin Hsin Ming" or "Verses on the Faith-Mind." This poem is considered a fundamental text in Zen Buddhism and is chanted daily in many Zen temples and monasteries. It emphasizes the importance of non-dualistic thinking and the understanding that all things are ultimately one.

Sosan's teachings also continue to be studied and shared in Chinese Zen communities through various texts and commentaries. His most well-known work, "The Zen Teachings of Sosan," is still widely read and studied by Zen practitioners. In this text, Sosan expounds on the nature of enlightenment and the practice of Zen meditation.

In addition to his teachings, Sosan's legacy is also celebrated through various ceremonies and rituals in Chinese Zen communities. For example, his birthday, which falls on the 15th day of the third lunar month, is often commemorated with special services and offerings.

Furthermore, Sosan's influence can be seen in the lineage of Chinese Zen teachers who have followed in his footsteps. Many modern Zen masters trace their lineage back to Sosan, and his teachings continue to be passed down through the generations.

Overall, Sosan is still highly revered and celebrated in modern Chinese Zen communities. His teachings and contributions to the development of Zen Buddhism have had a lasting impact and continue to guide practitioners in their pursuit of enlightenment. His legacy serves as a reminder of the timeless wisdom and profound insights that Zen Buddhism has to offer.