John Wesley on Philippians 2:6

Who being in the essential form - The incommunicable nature. Of God - From eternity, as he was afterward in the form of man; real God, as real man. Counted it no act of robbery - That is the precise meaning of the words, - no invasion of another's prerogative, but his own strict and unquestionable right. To be equal with God - the word here translated equal, occurs in the adjective form five or six times in the New Testament, Mt 20:12; Lu 6:34; Joh 5:18; Ac 11:17; Re 21:16. In all which places it expresses not a bare resemblance, but a real and proper equalitg. It here implies both the fulness and the supreme height of the Godhead; to which are opposed, he emptied and he humbled himself.