There is no such thing as Christian work. That is, there is no work in the world which is, in and of itself, Christian. Christian work is any kind of work, from cleaning a sewer to preaching a sermon, that is done by a Christian and offered to God.
This means that nobody is excluded from serving God. It means that no work is “beneath” a Christian. It means there is no job in the world that needs to be boring or useless. A Christian finds fulfillment not in the particular kind of work he does, but in the way in which he does it. Work done for Christ all the time must be “full-time Christian work.” (Discipline: The Glad Surrender, pg. 122)