Psalm 123

I lift up my eyes to you,
    to you who sit enthroned in heaven.
As the eyes of slaves look to the hand of their master,
    as the eyes of a female slave look to the hand of her mistress,
so our eyes look to the Lord our God,
    till he shows us his mercy.

Just because you get to choose your master, doesn't mean you aren't a slave to something.

Slaving away for the glory of God at least brings eternal consequences of amazing meaning and purpose. 

We could pick so many things to be a slave for, I'm glad that our King is a good one.