35 Come, heretic, what will your fatuous doctrine instruct us to believe of Christ; Christ, Who dispenses eternal life, Who is glorified of, and glorifies, the Father, Who overcame the world, Who, deserted, is not alone, but has the Father with Him, Who came out from God, and came from the Father? He is born with such divine powers; what of the nature and reality of God will you allow Him? It is in vain that we believe in the only true God the Father, unless we believe also in Him, Whom He sent, even Jesus Christ.
Why do you hesitate? Tell us, what is Christ to be confessed? You deny what has been written: what is left, but to believe what has not been written? O unhappy wilfulness! O falsehood striving against the truth! Christ is united in belief and confession with the only true God the Father: what faith is it, pray, to deny Him to be true God, and to call Him a creature, when it is no faith to believe in the only true God without Christ? But you are narrow, heretic, and unable to receive the Holy Spirit. The sense of the heavenly words escapes you; stung with the asp's poison of error, you forget that Christ is to be confessed true God in the faith of the only true God, if we would obtain eternal life.
Source: On the Trinity (New Advent)