God wills our happiness, and our happiness lies in our service to Him. God calls each by name to a particular service for which they were created and no other can do.
This is our work. This is the good we can do. This and this alone is what will bring true and everlasting happiness. Our work may be to design and construct a building or to be a brick or nail in the building. Each glorifies God. Each earns a saintly crown in its glorification of God’s will.