Philippians 2:7-8 (KJV) But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men: And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.
Trinitarians argue this means Jesus somehow gave up his God nature, or hid from it, or some other variation of the dual nature philosophy. This is a classic example of reading into the text from your biased viewpoint. A plain reading of the verse simply shows is that Jesus did not come to the world in his own name. He did not blow his own horn, which he could have being the king of Israel and God's anointed Messiah.
Instead he acted with all humility. To serve, not to be served.
Paul is teaching the church that we should be like Christ. See the previous verses.
Philippians 2:5 (KJV) Let this mind be in you, which was also in Christ Jesus:
This would not be much of a teaching if the following verses referred to giving up or hiding a divine nature. The whole passage is about humility and obedience.