Verses like John 14:28, where Jesus says, “The Father is greater than I,” have led to confusion in the church. The Bible seems to clearly teach that God the Father, Son, and Holy Spirit are all equally divine. They all possess the same attributes of deity. Then how can Jesus say the Father is greater than him?
The early church developed the doctrine of functional subordination to clarify the roles of the three members of the Trinity. Theologian Norman Geisler explains this doctrine in Systematic Theology, Volume Two: God, Creation :
All members of the Trinity are equal in essence, but they do not have the same roles. It is a heresy (called subordinationism) to affirm that there is an ontological subordination of one member of the Trinity to another, since they are identical in essence . . . ; nonetheless, it is clear that there is a functional subordination; that is, not only does each member have a different function or role, but some functions are also subordinate to others.
The Function of the Father
By His very title of ‘Father’ and His label of ‘the first person of the Trinity,’ it is manifest that His function is superior to that of the Son and the Holy Spirit. The Father, for example, is presented as the Source, Sender, and Planner of salvation.
The Function of the Son
The Son, on the other hand, is the Means, Sent One, and Achiever of salvation. The Father sent, and the Son came to save us; the Father planned it, but the Son accomplished it on the cross. This is why it is a heresy (called patripassianism) to claim that the Father suffered on the cross—only the Son suffered and died.
Further, the Son is eternally ‘begotten’ or ‘generated’ from the Father, but the Father is never said to be ‘begotten’ or ‘generated’ from anyone.
The Function of the Holy Spirit
According to orthodox theology, both East and West, the Holy Spirit is said to ‘proceed’ from the Father, but the Father never proceeds from the Holy Spirit—that is, the Father sends the Spirit, but the Spirit never sends the Father. . . . Many Eastern Orthodox theologians are willing to say that the Holy Spirit is sent by the Father indirectly through the Son, but they deny that the Son has authority to send the Holy Spirit on His own. Be that as it may, all agree that there is a functional subordination of the Holy Spirit to the Father.
In brief, the Father is the Planner, the Son is the Accomplisher, and the Holy Spirit is the Applier of salvation to believers. The Father is the Source, the Son is the Means, and the Holy Spirit is the Effector of salvation—it is He who convicts, convinces, and converts.
One final word about the nature and duration of this functional subordination in the Godhead. It is not just temporal and economical; it is essential and eternal. For example, the Son is an eternal Son (see Prov. 30:4; Heb. 1:3). He did not become God’s Son; He always was related to God the Father as a Son and always will be. His submission to the Father was not just for time but will be for all eternity. Paul wrote:
‘Then the end will come, when he hands over the kingdom of God the Father after he has destroyed all dominion, authority and power … When he has done this, then the Son himself will be made subject to him who put everything under him, so that God may be all in all. (1 Cor. 15:24, 28)’