Do you know what is the essay about the “owned slave”?            
 History   tells us about the slave trade and how a waster had the liberty to buy   whoever he wanted and enslave that person until his death or release  him  if he wanted. Some of those slaves after being release used to go  and  sell themselves to another master. Such slaves belittled freedom  and  were to be enslaved all their lives. The church scholars wrote the  essay  of the “owned slave” as an analogy that we were God’s servants  and free  at the same time, yet we sold ourselves to Satan. Our master  wanted to  purchase us back to Himself to free us. He purchased us with  His blood  “For you were bought at a price” (1Cor. 6:20). This was a  very heavy  price (the incarnation and crucifixion) the meanings of that  essay are  very profound.