" Now in holding up Christ as an example, he wants the Philippians to imitate Christ. But certainly he is not asking the Philippian Christians to “give up” or “lay aside” any of their essential attributes or abilities! He is not asking them to “give up” their intelligence or strength or skill and become a diminished version of what they were. Rather, he is asking them to put the interests of others first: “Let each of you look not only to his own interests, but also to the interests of others” (Phil. 2:4). And because that is his goal, it fits the context to understand that he is using Christ as the supreme example of one who did just that: he put the interests of others first and was willing to give up some of the privilege and status that was his as God. "

― Wayne Grudem , Systematic Theology: An Introduction to Biblical Doctrine