妙法蓮華經玄義 5.72

5.72

If one opens the provisional stage practices of the six perfections: giving is a dharma produced by causes and conditions, which is identical to emptiness, identical to the provisional, and identical to the middle. Opening giving allows one to see the buddha-nature, and so on through wisdom (prajñā). This is also called placing poison in milk, which can then kill a person. According to its stage, it is the nominal subtle; if one advances into expedients, it constitutes the semblance subtle; if one advances into the principle, it constitutes the partial-realization subtle, and so forth. For expedient śrāvakas who have not yet entered the stages, opening the provisional and revealing the real is also like this.