妙法蓮華經玄義 3.157

3.157

開麁論妙者，低頭舉手，積土弄砂，皆成佛道。雖說種種法，其實為一乘。諸行皆妙，無麁可待，待即絕矣。

As for opening the crude and discussing subtlety: bowing the head, raising a hand, piling earth, or playing with sand, all achieve the buddha path. 'Although various teachings are spoken, in reality they are for the eka-yāna.' All practices are subtle; there is no crude to contrast with, and when contrast is made, [duality] is extinguished.