From the Yuan-dynasty zaju play
《剪发待宾》 (Cutting Hair to Receive Guests) by Qin Jianfu (
秦简夫):
贵脚踏于贱地，
蓬荜生光 'Your noble feet step on humble ground - the thatched-and-thornwood gate gains splendor'.
蓬 (péng, fleabane / thatch grass) and
荜 (bì, hawthorn / brushwood) refer to the materials of a poor man's gate, by extension a humble home.
