St. John Chrysostom ca. 349-407
Through union, God the Logos and the Flesh are one, without the occurrence of a mingling, without the disappearance of the natures, but because of an ineffable, indefinable union. How this union took place, ask not. God alone knows. Homily 26, On the Gospel of John in Migne, Patrologia Graeca 59, 154)