妙法蓮華經玄贊 4.140

4.140

贊曰：此一頌令入，今者果滿遂昔願心，故化眾生入於佛道。道者因義，令入八地或初地上不退轉位，佛之因故。

The Eulogy says: This single verse causes entering: now that the fruit is fulfilled, following the mind of past vows, he therefore transforms sentient beings so that they enter the Buddha Path. 'Path' has the meaning of cause, meaning to cause them to enter the eighth ground or the non-retrogressing stage on the first ground and above, because it is the cause of the Buddha.