《新唐书·列传·卷六十四》
开元年间，写了《封禅书》，去游说宰相张说，张说对他感到惊奇，任命他为校书郎。
开元中，作《封禅书》，说宰相张说，说奇之，奏为校书郎。
During the Kaiyuan era, he wrote the "Book of Zen Buddhism" and went to lobby Prime Minister Zhang Shuo, who was amazed by him and appointed him as a proofreader.