15 And so the Son glorifies the Father fully and finally in the words which follow, I have glorified You on the earth, having accomplished the work which You have given Me to do. All the Father's praise is from the Son, for every praise bestowed upon the Son is praise of the Father, since all that He accomplished is what the Father had willed. The Son of God is born as man; but the power of God is in the virgin-birth. The Son of God is seen as man; but God is present in His human actions.
The Son of God is nailed to the cross; but on the cross God conquers human death. Christ, the Son of God, dies; but all flesh is made alive in Christ. The Son of God is in hell; but man is carried back to heaven. In proportion to our praise of Christ for these His works, will be the praise we bring to Him from Whom Christ's Godhead is. These are the ways in which the Father glorifies the Son on earth; and in return the Son reveals by works of power to the ignorance of the heathen and to the foolishness of the world, Him from Whom He is.
This exchange of glory, given and received, implies no augmentation of the Godhead, but means the praises rendered for the knowledge granted to those who had lived in ignorance of God. What, indeed, could there be which the Father, from Whom are all things, did not richly possess? In what was the Son lacking, in Whom all the fullness of the Godhead had been pleased to dwell? The Father is glorified on earth because the work which He had commanded is finished.
Source: On the Trinity (New Advent)