There is joy in work. There is no happiness except in the realization that we have accomplished something. (Henry Ford, early automaker)
Ford was known for his inventions and for being a very demanding employer. Some today may agree with him about work. After all, many jobs require strenuous labor with little relief. Ford is right that you can be happy about your accomplished task. But there ought to be some sense of joy that you have a job that benefits others.
Hard work brings rewards (Proverbs 12:14). It is good for people to eat, drink, and enjoy their work under the sun during the short life God has given them (Ephesians 5:18).