Most of the titles we wear as Christians are positive in nature or pleasing in meaning. Who wouldn't want to 'follow' Jesus or be a part of God's 'family' or even be associated as a 'servant'? The reality is that the concept of slavery is so viewed negatively that it is a term that offends people. The understanding of Paul's title of a slave is key to our relationship with Christ.
As the Holy Spirit convicts us, and we respond to Him in submission which results in repentance; we enter into a relationship with Jesus Christ. We often abuse this relationship because of a misunderstanding of the relationship. We love the part of our relationship that brings freedom and liberty. We love the end result of this relationship which is spending eternity in Heaven. We focus on our side of the relationship that we typically neglect or purposefully ignore His side. We are called to surrender our lives and our everything to Christ. Essentially, we are to become Slaves of Christ.
The best picture of this that I can think of comes from an animated film that came out when I was in like 2nd Grade, Aladdin. In the movie, there was a genie in an ancient lamp. This genie was to grant any wishes to the boy, Aladdin, that rubbed the lamp. You see, most of the time we view ourselves as the boy and God as the genie, when in reality it is the opposite (kind of). At the end of the movie, Aladdin does the unspeakable and wishes the genie to be free. So now, the genie is free to do whatever he wants to do, yet is still capable of being a slave to his master. We are the genie that has been given amazing freedom, yet in our freedom we long to be slave to the one who freed us.
What do you think?