The brahmin Uṇṇābha points out that the five physical sense faculties do not share a common domain, so where do they come together? In the mind. Uṇṇābha pursues the teaching all the way to Nibbāna.
The Buddha discusses the five faculties and the five powers. They are like a river that flows around a central island. From one point of view they can be considered different, but from another they are just the same stream.
The Buddha asks Sāriputta whether a noble disciple doubts the Buddha. Not only does he have faith, replies Sāriputta, but the other faculties each come to be developed in turn.