6 Set our modern heresy in array against the delusion, equally wild, of Sabellius; let them make the best of their case. The new heretics will advance the passage. The Father is greater than I. Neglecting the mystery of the Divine birth, and the mystery of God's emptying Himself and taking flesh, they will argue the inferiority of His nature from His assertion that the Father is the greater. They will plead against Sabellius that Christ is a Son, in so far as One can be a Son who is inferior to the Father and needs to ask for restoration to His glory, and fears to die and indeed did die.
In reply Sabellius will adduce His deeds in evidence of His Divine nature; and while our novel heresy, to escape the admission of Christ's true Sonship, will heartily agree with him that God is One, Sabellius will emphatically assert the same article of the faith, in the sense that no Son exists. The one side lays stress upon the action of the Son; the other urges that in that action God is manifest. The one will demonstrate the unity, the other disprove the identity. Sabellius will defend his position thus:— “The works that were done could have been done by no other nature than the Divine.
Sins were remitted, the sick were healed, the lame ran, the blind saw, the dead lived. God alone has power for this. The words I and the Father are One could only have been spoken from self-knowledge; no nature, outside the Father's, could have uttered them. Why then suggest a second substance, and urge me to believe in a second God? These works are peculiar to God; the One God wrought them.” His adversaries, animated by a hatred, equally venomous, for the faith, will argue that the Son is unlike in nature to God the Father:— “You are ignorant of the mystery of your salvation.
You must believe in a Son through Whom the worlds were made, through Whom man was fashioned, Who gave the Law through Angels, Who was born of Mary, Who was sent by the Father, was crucified, dead and buried, Who rose again from the dead and is at the right hand of God, Who is the Judge of quick and dead. Unto Him we must rise again, we must confess Him, we must earn our place in His kingdom.” Each of the two enemies of the Church is fighting the Church's battle. Sabellius displays Christ as God by the witness of the Divine nature manifested in His works; Sabellius' antagonists confess Christ, on the evidence of the revealed faith, to be the Son of God.
Source: On the Trinity (New Advent)