Also I say unto you, Whosoever shall confess me before men, him shall the Son of man also confess before the angels of God:
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Cyril of Alexandria
AD 444
Now Paul says, If you will confess with your mouth the Lord Jesus, and believe in your heart that God raised him from the dead, you shall be saved. The whole mystery of Christ is conveyed in these words. For we must first confess that the Word born of God the Father, that is, the Only-Begotten Son of His substance, is Lord of all, not as one who had gained His Lordship from without and by stealth, but who is in truth by His nature Lord, as well as the Father. Next we must confess that God raised Him from the dead, who was Himself truly made man, and suffered in the flesh for us; for such He rose from the dead. Whoever then will so confess Christ before men, namely, as God and the Lord, Christ will confess him before the angels of God at that time when He shall descend with the holy angels in the glory of His Father at the end of the world.
Now they who deny are first indeed those who in time of persecution renounce the faith. Besides these, there are heretical teachers also, and their disciples.
But if our Savior means to imply, that if any injurious word is spoken by us against a common man, we shall obtain pardon if we repent, there is no difficulty in the passage, for since God is by nature merciful, He restores those who are willing to repent. But if the words are referred to Christ how is he not to be condemned who speaks a word against Him?
But if the Holy Spirit were a creature, and not of the divine substance of the Father and the Son, how does an injury committed against Him entail upon it so great a punishment as is denounced against those that blaspheme against God?
But the Lord after having inspired such great fear, and prepared men to resist those who depart from a right confession, commanded them for the rest to take no care what they should answer, because for those who are faithfully disposed, the Holy Spirit frames fit words, as their teacher, and dwelling within them. Whence it follows, And when they shall bring you into synagogues, take no thought how or what you shall answer.