elderwho,
What then did Jesus empty himself of ?
The answer becomes clear when a person reads the letter to the Philippians in its entirety. Trinitarians take texts out of context just as JWs do, and then they build a case based upon that text without considering what the original writer had in mind.
If I had the time, I'd love to illustrate for you what Paul's design was in each chapter, but let's focus on chapter 2.
In the first chapter he told the Philippians that his prayer for them was that their love may abound more and more, that they may be "filled with righteousness that comes through Christ Jesus--to the glory and praise of God." (1:9-11) He contrasted persons of envy, rivalry, selfish ambition and false motives with those of goodwill, love, sincerity and true motives. (1:15-18) He made it clear that it's a struggle to live as Christians should. (19-30)
In chapter 2, Paul urged the Philippians to be humble as Jesus was. He described the exalted status of the man Jesus. As the reflection of God his Father, he was in the "form of God." Note that the text does not say he was God. As God's chief agent on earth, Jesus had been invested with a functional equality with God and was destined to sit at God's right hand. But instead of taking advantage of his royal position as God's legal representative, he humbled himself by being the servant of mankind, even to the point of submitting to a criminal's death on the cross. The transition is from the rank of God's "right hand man" to the rank of a servant. The contrast is not between being God and becoming man. What Paul had in mind is the career of the man Christ Jesus, not the incarnation of someone from heaven. Jesus' humility is the exact opposite of the arrogance of Adam. Adam, under the Devil's influence, tried to grasp at an equality with God to which he was not entitled. Jesus, on the other hand, did not abuse his God-given status as the agent of God his Father.
While urging the Philippians to be like Jesus, Paul wrote of his own 'emptying of himself' as Jesus had done. He wrote: "But even if I am being poured out as a drink offering upon the sacrifice and service of your faith, I rejoice." (2:17)
Then he gave the examples of Timothy and Epaphroditus. Concerning Timothy: "For I have no one else of kindred spirit who will genuinely be concerned for your welfare. For they all seek after their own interests, not those of Christ Jesus." (2:20, 21) And concerning Epaphroditus: "Receive him then in the Lord with all joy, and hold men like him in high regard; because he came close to death for the work of Christ, risking his life to complete what was deficient in your service to me." (2:29, 30)
In chapter 3, Paul further mentioned how he had "emptied himself." He wrote: "But whatever things were gain to me, those things I have counted as loss for the sake of Christ. More than that, I count all things to be loss in view of the surpassing value of knowing Christ Jesus my Lord, for whom I have suffered the loss of all things, and count them but rubbish so that I may gain Christ, and may be found in Him, not having a righteousness of my own derived from the Law, but that which is through faith in Christ, the righteousness which comes from God on the basis of faith, that I may know Him and the power of His resurrection and the fellowship of His sufferings, being conformed to His death; in order that I may attain to the resurrection from the dead." (3:7-11)
I think that, if you will read the letter to the Philippians in one sitting with the above thoughts in mind, you will conclude that Jesus emptied himself, not of being God, but of living as he had every right to live, as the royal heir to the throne of David and as God's chief agent upon earth.
herk