《太平广记·卷二百八十五·幻术二》
唐代，道士罗公远小时候并不聪明，可自从进了梁山数年之后，忽然间有了特殊的本领，无论猜什么事都能够猜对。
唐道士罗公远，幼时不慧。遂入梁山数年，忽有异见，言事皆中。
In the Tang Dynasty, when Daoist Luo Gongyuan was a child, he was not very intelligent. However, several years after entering Liangshan, he suddenly acquired a special ability, and he was able to guess anything correctly.