“I and the Father are one”.
All not-at-one-ness, all division, rests on a concealed lack of real Christliness, on a clinging to individuality that hinders the coalescence into unity.
The most individual element in us – the only thing that belongs to us in the last analysis – our own “I”, is at the same time the least individual element of all, for it is precisely our “I” that we have neither from ourselves nor for ourselves. The “I” is simultaneously what I have completely and what least of all belongs to me. Thus, here again the concept of mere substance (= what stands in itself ! ) is shattered, and it is made apparent how being that truly understands itself grasps at the same time that in being itself it does not belong to itself; that it only comes to itself by moving away from itself and finding its way back as relatedness to its true primordial state.
J. Ratzinger. (1969) Intro to C. (pp189-190)