釋禪波羅蜜次第法門 6.126

6.126

答曰：今此中用八聖種，但是欲疾離下修上地定，不能即深觀自地，發無漏慧故，與無漏有異。

Answer: Here, the use of the eight noble lineages is merely for the sake of quickly departing from the lower and cultivating the absorption of the upper stage; because one cannot directly contemplate one's own stage deeply to generate undefiled wisdom, it differs from the undefiled.