Do not let men deceive themselves and others by saying that the 'Man of the Lord,' which is the title they give to him who is rather 'Our Lord and God,' is without a human mind. We do not separate the Man from the Deity, no, we assert the dogma of the unity and identity of the Person, who aforetime was not man but God, the only Son before all ages, who in these last days has assumed manhood also for our salvation; in his flesh passible, in his Deity impassible; in the body circumscribed, uncircumscribed in the Spirt; at once earthly and heavenly, tangible and intangible, comprehensible and incomprehensible; that by one and the same person, perfect man and perfect God, the whole humanity, fallen through sin, might be created anew.
If any one does not believe that holy Mary is the mother of God (Theotokos), he is cut off from the Deity. ... If any assert that the manhood was fashioned and afterwards endued with the Deity, he also is to be condemned. ... If any bring in the idea of two sons, one of God the Father, the other of the mother, may he lose his share in the adoption. ... For the Godhead and the manhood are two natures, as are soul and body, but there are not two Sons or two Gods. ... For both natures are one by the combination, the Godhead made man or the manhood deified, or whatever be the right expression. ...
If any should say that the Deity worked in him by grace... but was not and is not united with him in essence...(let him be anathama.) If any assert that he was ... accounted worthy of sonship by adoption... (let him be anathama.) If any say that his flesh came down from heaven and is not from hence, but is above us, not of us... (let him be anathama.)
If any one has put his trust in him as a man without a human mind, he is himself devoid of mind and unworthy of salvation. For what he has not assumed he has not healed; it is what is united to his Deity that is saved. ... Let them not grudge us our entire salvation, or endue the savior only with the bones and nerves and appearance of humanity.
But, he urges, he could not contain two complete natures. Certainly not, if you are thinking of him physically. A bushel measure will not hold two bushels. ... But if you will consider the mental and the incorporeal, bear in mind that in my one personality I can contain soul, reason, mind, and Holy Spirit. ...
(Apollinarius was condemned by synods at Alexandria and Rome, and by the Second Ecumenical Council (I Constantinople - 381 A.D.))