If I were hungry I would not tell you,
for the world is mine, and all that is in it.
Here we have more of the God's ownership/lordship. The world is His and everything in it. We can be servants to God, but unlike a lord here on earth, God the Lord does not stand in need of His servants. He is not waiting at the table for His dinner to arrive.
Let the service we do be because we love Him, not because we think that we are filling some heavenly need.