Paul in the parallel passage in the fourth chapter of Galatians says: ‘God hath sent forth the Spirit of His Son into our hearts’ – the Spirit of His own Son. Do we realize that as Christians we have within us the self-same Holy Spirit that was in the Son of God when He was here on earth? The Father gives the Spirit and it is the same Spirit that was in the Son that is given to us. The Spirit that enabled Him will enable us.
– Martyn Lloyd-Jones in Spiritual Depression (Grand Rapids, Mi: Eerdmans), 171.