'Work' in the Bible

For I am sure of this very thing, that the one who began a good work in you will perfect it until the day of Christ Jesus.

Now if I am to go on living in the body, this will mean productive work for me, yet I don't know which I prefer:

since it was because of the work of Christ that he almost died. He risked his life so that he could make up for your inability to serve me.