Of Mar Babai the Great in the sixth century CE
One is Christ the Son of God,
Worshiped by all in two natures;
In His Godhead begotten of the Father,
Without beginning before all time;
In His humanity born of Mary,
In the fullness of time, in a body united;
Neither His Godhead is of the nature of the mother,
Nor His humanity of the nature of the Father;
The natures are preserved in their Qnumas(hypostasis),
In one person of one Sonship.
And as the Godhead is three substances in one nature,
Likewise the Sonship of the Son is in two natures, one person.
So the Holy Church has taught.