《南齐书·列传·卷四十一》
西凉州的智林道人给周颙寄信说： 这一法义的幽微旨趣好像并不是才被发掘的，神奇美妙的声音已经中断了六七十年。
西凉州智林道人遗颙书曰： 此义旨趣似非始开，妙声中绝六七十载。
Monk Zhilin from the Western Liang state wrote to Zhou Yong, saying: This Dharma Teaching's profound and subtle truths do not seem like something that has just recently been discovered. Its wonderful and miraculous voice has been silent for 60 or 70 years.