首楞嚴義疏注經 6.2

6.2

第五、返聞真實證。此門次第合次那律，以是六根之耳根故。今以圓通義廣，慶說相繼，勅簡連環，故最後說，以表臻極真實故爾。若前便說，諸佛放光慶贊此門，即餘聖無功。若不慶贊，不表此門是真圓通，故今科為返聞真實也。

Fifth, the true realization of turning hearing inward. In sequence, this section should properly follow Aniruddha, because it concerns the ear faculty among the six sense faculties. Here, because its meaning of perfect penetration is broad, its joyous expounding continues, and the imperial selection forms an unbroken chain, it is spoken of last to indicate that it has reached the utmost truth. If it had been spoken of previously, all the Buddhas would have emitted light to rejoice in and praise this gate, and then the other sages would seem devoid of merit. If they did not rejoice in and praise it, it would not manifest that this gate is true perfect penetration. Therefore, the present heading is 'the true [realization] of turning hearing inward.'