請觀音經疏闡義鈔 1.32

1.32

「觀門有異」者，如《法華》四安樂行為入理之門，今經以數息等為入理之門。又四教四門不同，俱是異義。

"Contemplation gates differ": just as in the Lotus Sūtra the four peaceful and joyful practices are the gate for entering the principle, the present sūtra uses counting breaths and so forth as the gate for entering the principle. Furthermore, the four gates of the four teachings are distinct; these all illustrate the meaning of "differ."