Romans 12:4

One body. The reason why Christians must have humility and good judgment is that the church, like the human body, is made up of many members having different functions to perform. These functions are all necessary and important, but all do not seem to be equally glorious. The well-being and advancement of the whole group depend upon a spirit of love, cooperation, and mutual esteem among the members, each individual discharging his appointed duties. This figure of the body and its members is worked out more fully in 1 Corinthians 12:12-27.

Office (Greek: praxis), “function,” “mode of acting.”