法華玄義釋籤 2.29

2.29

不定遍前四味，若直語方等，但彈斥而已。既以身土令物殊途，正當不定；般若亦然，思之可見。

The indeterminate pervades the previous four flavors. If one speaks directly of the Vaipulya, it consists merely of reproach. Since [the Tathāgata] caused beings to take different paths by means of his bodies and lands, it precisely corresponds to the indeterminate; the same is true of the Prajñāpāramitā. One can see this by reflecting upon it.