肇論新疏 2.12

2.12

揚淳（粹）風（教）於東扇。將爰（語辭）燭（照）殊方，而匿（隱）耀（光）涼土者，所以道不虛應，應必有由矣。

and spread the pure teaching to the eastern regions. He was about to illuminate foreign lands, but hid his brilliance in the territory of Liang; this was because the Way does not respond in vain, and when responding, it must have a cause.