首楞嚴義疏注經 4.481

4.481

若約佛根無礙，六根總得圓通，即同《殃掘經》云「所謂彼眼根，於諸如來常，具足無減修，了了分明見。」乃至六根皆作是說，故云亦無優劣。但汝下約劣根須揀，根非徑要，劫修無益，若得圓門，日功倍勝，故一根返源，六根清淨。

If considered in terms of the unobstructed faculties of a Buddha, all six faculties achieve perfect penetration. This is just as the Aṅgulimālīya Sūtra states: 'That so-called eye faculty, in all tathāgatas, is permanent, completely cultivated without decrease, clearly and distinctly seeing.' The same is said for all faculties up to the sixth; hence it is said, 'there is also neither superior nor inferior.' From 'But you...' downward, it considers inferior faculties and the necessity of choosing: if a faculty is not an essential shortcut, cultivating for kalpas yields no benefit; but if one gains the perfect door, a single day's effort will be doubly superior. Hence, when one faculty returns to the source, the six faculties are purified.