妙法蓮華經玄贊 9.507

9.507

贊曰：此喻問答辨此不虛。一問，二答，三成。此說化身如醫示死，報身如父實體常存。涅槃之義如別章說。

The Commentary says: This is the question and answer of the parable, determining that this is not false. First the question, second the answer, third the conclusion. This states that the transformation body is like the physician displaying death, while the reward body is like the father whose actual substance is eternally enduring. The meaning of nirvāṇa is as explained in a separate chapter.