《太平广记·卷十八·神仙十八》
我在他门下已当了十纪的扫地仆人才让我当了守门人，至今还没有得到道经的要诀呢。 
仆自扫门已来，于兹十纪，始蒙召进，得预门人，犹未深受要诀，只令守门。 
I have been a sweeper under his tutelage for ten decades before he let me be a gatekeeper. To this day, I still have not received the essentials of the Daoist scripture.