1 Corinthians 12:19

And if they were all one member
As all eye, or all ear, or all hand, or all foot: where were the body?
where would be the body? it would not be a body consisting of such proper and suitable members, as now it is: so if the community of the saints were either all ministers, or all hearers there would be no body, consisting of different persons, to receive any benefit or usefulness from either; the church of Christ would not be that uniform, useful, and consistent community it is.