However , if Ûisang wrote the “ seal text " and commentary in China just prior to Chih － yen ' s death , and there are no mentions of this text and its authorship anywhere in the works of Fa － tsang or his Chinese successors , then Ûisang must have told his pupils the story of its origins himself . The two extant versions of the writing process must then be due to mistakes in the oral transmission or to differing traditions that arose within Silla because of internal divisions between Hwam groups . If the Wônsangnok was by Sangwôn , it would predate the biography by Ch ' oe Ch ' iwôn . Yet Ch ' oe was connected to a lineage of Hwaôm that can be traced back to Sangwôn , and thus Ch ' oe ' s sources may have been of considerable vintage and veracity also . However , this does not mean that we can simply dismiss the evidence of the Wônsangnok as Kyun ' yô did , for Ch ' oe had great pride in Silla Buddhist achievements and so tended to promote Silla monks over their Chinese counterparts . He may thus have been tempted to downplay the role of Chih － yen in the writing of the “ seal text ", despite the fact he venerated Chih － yen .