Read Philippians 2:7-8. The word slave -- the very nature of a servant -- means Jesus gave up the privilege of divinity for the opportunity to "slave."
In the New Testament, the Greek word, doulos, is translated slave or servant; it means slave.
If we have the same attitude as Jesus, and that means slave, then God is our master.
Servants have a choice of saying "no," slaves do not. Where are you saying "no" to God that you need to say "yes?"