《太平广记·卷二百八十五·幻术二》
他曾经拜道士张元肃为师，张授之以要领，崔简渐渐学会役使神灵及凭空变化等本事。
尝遇道士张元肃晓以道要，使役神物，坐通变化。
He used to worship the Taoist priest Zhang Yuansu as his teacher. Zhang taught him the essentials, and Cui Jian gradually learned the ability to control gods and spirits and to change out of thin air.