I must refer to scripture since it is the basis for my beliefs.
Philippians 2:5 Let this mind be in you, which was also in Christ Jesus:
6 Who, being in the form of God, thought it not robbery to be equal with God:
7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:
Here is an explanation from Robertson's word pictures in original Greek:
Being (huparchôn). Rather, "existing," present active participle of huparchô. In the form of God (en morphêi theou). Morphê means the essential attributes as shown in the form. In his preincarnate state Christ possessed the attributes of God and so appeared to those in heaven who saw him. Here is a clear statement by Paul of the deity of Christ. A prize (harpagmon). Predicate accusative with hêgêsato. Originally words in mos signified the act, not the result (ma). The few examples of harpagmos (Plutarch, etc.) allow it to be understood as equivalent to harpagma, like baptismos and baptisma. That is to say Paul means a prize to be held on to rather than something to be won ("robbery"). To be on an equality with God (to einai isa theoi). Accusative articular infinitive object of hêgêsato, "the being equal with God" (associative instrumental case theôi after isa). Isa is adverbial use of neuter plural with einai as in Re 21:16. Emptied himself (heauton ekenôse). First aorist active indicative of kenoô, old verb from kenos, empty. Of what did Christ empty himself? Not of his divine nature. That was impossible. He continued to be the Son of God. There has arisen a great controversy on this word, a Kenosis doctrine. Undoubtedly Christ gave up his environment of glory. He took upon himself limitations of place (space) and of knowledge and of power, though still on earth retaining more of these than any mere man. It is here that men should show restraint and modesty, though it is hard to believe that Jesus limited himself by error of knowledge and certainly not by error of conduct. He was without sin, though tempted as we are. "He stripped himself of the insignia of majesty" (Lightfoot).