23 They have not the love of God in them, He says, because they rejected Him coming in the name of the Father, but accepted another, who came in the same name, and received glory of one another, but neglected the glory of Him, Who is the only true God. Is it possible to think that He separates Himself from the glory of the only God, when He gives as the reason why they seek not the glory of the only God, that they receive Antichrist, and Himself they will not receive?
To reject Him is to neglect the glory of the only God; is not, then, His glory the glory of the only God, if to receive Him steadfastly was to seek the glory of the only God? This very discourse is our witness: for at its beginning we read, That all may honour the Son, even as they honour the Father. He that honours not the Son, honours not the Father which sent Him. It is only things of the same nature that are equal in honour; equality of honour denotes that there is no separation between the honoured.
But with the revelation of the birth is combined, the demand for equality of honour. Since the Son is to be honoured as the Father, and since they seek not the honour of Him, Who is the only God, He is not excluded from the honour of the only God, for His honour is one and the same as that of God: just as He that honours not the Son, honours not the Father also, so he who seeks not the honour of the only God, seeks not the honour of Christ also. Accordingly the honour of Christ is inseparable from the honour of God.
By His words, when the news of Lazarus' sickness was brought to Him, He illustrates the complete identification of Father and Son in honour: This sickness is not unto death, but for the glory of God, that the Son of Man may be glorified through him. Lazarus dies for the glory of God, that the Son of God may be glorified through him. Is there any doubt that the glory of the Son of God is the glory of God, when the death of Lazarus, which is glorious to God, glorifies the Son of God?
Thus Christ is declared to be one in nature with God the Father through His birth, since the sickness of Lazarus is for the glory of God, and at the same time the Mystery of the faith is not violated, for the Son of God is to be glorified through Lazarus. The Son of God is to be regarded as God, yet He is none the less to be confessed also Son of God: for by glorifying God through Lazarus, the Son of God is glorified.
Source: On the Trinity (New Advent)