Visuddhimagga XVI-6

Apica ādhipaccasaṅkhātena issariyaṭṭhenāpi etāni indriyāni.

又此等之所以说为根，是（六）因为称为增上（有力）的自在之义。

Ñ(XVI,6): Furthermore, they are faculties (rulership) in the sense of lordship called predominance.

Cakkhuviññāṇādippavattiyañhi cakkhādīnaṃ siddhaṃ ādhipaccaṃ,

即眼识等的生起，是眼等的成就之力（增上），

Ñ: For predominance of the eye, etc., is implied in the occurrence of eye-consciousness, etc.,

tasmiṃ tikkhe tikkhattā mande ca mandattāti.

若此等（成就之力）锐利时，彼等（眼识等亦起）锐利，此等迟钝时，彼等亦迟钝。

Ñ: because of the (consciousness's) keenness when that [faculty] is keen and slowness when it is slow.

Ayaṃ tāvettha atthato vinicchayo.

这是先以义而抉择。

Ñ: This, firstly, is the exposition as to meaning.