By Richard Rohr, 2 Oct 2017
On that day, you will know that you are in me and I am in you. —John 14:20
“That day” John refers to has been a long time in coming, yet it has been the enduring message of every great religion in history. It is the Perennial Tradition. Divine and thus universal union is still the core message and promise—the whole goal and the entire point of all religion.
Lady Julian of Norwich uses the idea of “oneing” to describe divine union. She writes:
The soul is preciously knitted to him in its making, by a knot so subtle and so mighty that it is oned into God. In this oneing, it is made endlessly holy. Furthermore, he wants us to know that all the souls which are one day to be saved in heaven without end are knit in this same knot and oned in this oneing, and made holy in this one identical holiness. 
Julian says, “By myself I am nothing at all, but in general, I am in the oneing of love. For it is in this oneing that the life of all people exists.”  She continues: “The love of God creates in us such a oneing that when it is truly seen, no person can separate themselves from another person” , and “In the sight of God all humans are oned, and one person is all people.” 
This is not some 21st century leap forward in theology. This is not pantheism or mere “New Age” optimism. This is the whole point and always has been. It was, indeed, supposed to usher in a new age—and it still can and will. Radical union is the recurring experience of the saints and mystics of all religions. Our job is not to first discover it, but only to retrieve what has been re-discovered—and enjoyed, again and again—by those who desire and seek God and love. When you think you have “discovered” it, you will be just like Jacob “when he awoke from his sleep” and shouted, “You were here all the time, and I never knew it!” (Genesis 28:16)