The book "Slave" by John MacArthur is a truly epic work and should be read by all Christians big and small (Spiritually speaking).
Link to Amazon.co.uk >> "Slave" by John MacArthur <<
This book will challenge your faith to its core and you will either end up with a better and profound understanding of your true relationship with Christ or not being able to stomach and buy into this way of looking at who you are in God's eyes.
The really good news is that Christ paid the price for your enslavement to Him with his life. He bought you slave with His life. Remember he is the very best master in the world. No matter whether we are Jew, African, French or alien when we can cry "Jesus is Lord" by every fibre of our body and our spirit burns with love and joy at the sound of our master's name and voice then the Nazarene has claimed you His slave.
You can purchase the book from Amazon here; "Slave" by John MacArthur
The profile of a slave of Christ: https://luvacta.org/slave
How is a Christ slave defined and why can true Christians be redefined as slaves of the Lord Jesus Christ: https://luvacta.org/a-christ-slave