Three Spheres of Christian Activity. What God has asked the believer to do (i.e. Christian activity) can be largely divided into three spheres: office, gift, and priesthood. When all of these spheres are maintained in their proper order, the result is the God is glorified and His people are blessed. There is a danger of of confusing the various spheres of activity, and this can lead to serious trouble.
There is some similarity between office and gift (e.g. pastor is a gift, overseer is an office), yet the three spheres are kept distinct in scripture. For instance, gift is for the whole body, but office is limited to the local assembly. In 1 Tim. 5:17 Pauls shows that elders (an office) may or may not minister the word (a gift). In fact, the Catholic system is the product of confusing all three spheres: gift, office, and priesthood!