In the Incarnation , as traditionally defined by those Churches that adhere to the Council of Chalcedon , the divine nature of the Son was united but not mixed with human nature in one divine Person , Jesus Christ , who was both `` truly God and truly man '' .
In the Bible its teaching is in the Gospel of John , where in chapter 1 verse 14 ( abbreviated as `` John 1:14 '' ) , it says `` And the Word became flesh , and dwelt among us , '' In the Incarnation , normally defined , the divine nature of the Son was joined but not mixed with human nature in one divine Person , Jesus Christ , who was both `` truly God and truly man '' .