Who, being in the form of God, thought it not robbery to be equal with God:…
To be in the form of God signifies not only to be King, to possess majesty and power, but also to have the insignia of royalty, its courtly train and equipage. Thus formerly among the Romans we might call the form of a consul, the equipage and pomp with which the laws and customs of that people invested those who exercised the office; the purple, the ivory chair, the twelve lictors with their fasces and rods, and such like. When, then, the apostle here says that the Lord, before taking our nature upon Him, was in the form of God, he does not merely intend that He was God in Himself, and that He had the true nature of the divinity; but, further still, that He possessed the glory and enjoyed all the dignity, majesty, and grandeur due to so high a name. This is precisely what our Lord means in St. John by the glory which He says He had with the Father before the world was.
Parallel VersesKJV: Who, being in the form of God, thought it not robbery to be equal with God: