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 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 al the time must be “full-time Christian work”.
For most human beings, for most of history, there has been little choice available. We tend to forget this in a time when the options seem limitless and when “what one does” usually means specifically his money-earning capacities. Duty, however, includes whatever we ought to do for others- make a bed, give someone a ride to church, mow a lawn, clean a garage, paint a house. It is often possible to get out of work like that. Nobody is paying us. It simply needs to be done, and if we dont do it, nobody will. But the nature of the work changes when we see that it is God who marks out this line of duty for us. It is service to Him.
Work is a blessing. God has so arranged the world that work is necessary, and He gives us hands and strength to do it. The enjoyment of leisure would be nothing if we had only leisure. It is the joy of work well dome that enables us to enjoy rest, just as it is the experiences of hunger and thirst that make food and drink such pleasures.
The Christian has all these in Christ: work, a Master, a hope. Yet how easily we forget this. Let us lift up our work as we lift up our hands, our hearts, our bodies- a sacrifice acceptable because it is lifted up to Him who alone can purify.
Elisabeth Elliot - Disciplines, the Great Surrender.
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Whether that be writing papers, listening to lecturers, answering phone calls all day, filing papers, dealing with angry customers, washing dishes, carrying trash bags, cleaning bathrooms, teaching a class of unattentive students, being patient, filling medications on a busy day, dealing with difficult people, helping someone with their homework, sitting in meetings, helping a stranger carry groceries, studying for a midterm, handling finances, cleaning the house, feeding a baby, cleaning toilet seats, going to a 12-hour clinical..
how many opportunities we have to serve Him! :)