 The principal text of the Shangqing School is known as The True Text of the Great Dong (Dadong Zhenjing, 大洞真經).Dong can be translated as cave or grotto, but also has other meanings such as ‘to communicate.’ When the texts were dictated to Yang Xi, the immortals told him that they were the condensed form of primordial qi, and existed before the world was born.Eventually the texts congealed and were sent by heaven to be dictated to Yang.