The entire essence of existence, God himself, is a relationship, according to Joseph Ratzinger "God, too, is absolute permanence, as opposed to everything transitory, for the reason that he is the relation of three Persons to one another, their incorporation in the "for one another" of love, act-substance of the love that is absolute and therefore completely "relative", living only "in relation to". As we said earlier, it is not autarchy, which knows no one but itself, that is divine; what is revolutionary about the Christian view of the world and of God, we found, as opposed to those of antiquity, is that it learns to understand the "absolute" as absolute "relatedness", as relatio subsistens." (Introduction to Christianity, 1968).
Relationship rests on communication. I will not be able to relate to you if I cannot communicate with you or if I do not have the intention of communicating with you. We know that the first communication in infants takes place when they suck on their mothers breasts. As little as one month, Rene Girard, correcting the great Jean Piaget, has shown that Children start immitating their parents and people around them and they learn how to communicate in gestures before they learn language. But communication goes deeper than using mere language. There is also body communication or body language. What matters in the end is the result: Relationship!
John Polkinghorne, professor of nuclear physics at Cambridge University, wrote, in one of his latest books: Quantum Physics and Theology, about relationship as science is attempting to discover it at the subnuclear level: "Quantum theory brought to light a remarkable form of entanglement between subatomic particles that have once interacted with each other (the so-called EPR effect), which implies that they remain effectively a single system however far they may subsequently separate spatially- a counterintuitive togetherness-in-separation that has been abundantly confirmed experimentally as a property of nature. The physical world looks more and more like a universe that would be the fitting creation of the trinitarian God, the One whose deepest reality is relational" (Quantum Physics and Theology, p.104). Not only at the human level. Not even at the living cells level. But also at the microcosmic level there seems to be an inherent structure that calls for relationship.
We started with God and we will end up with God. But in between we move from the Big Bang, the formation of the high energy singularity as Stephen Hawking likes to call it, into galaxies, hundreds of thousands, to arrive into the Sun, and eventually the Earth. In this entire process non-living matter has solidified. Wait a minute or, in fact, 10 billions of years. Life then starts on Earth. In some 3.5 billion years humans appear from apes.
Here it is again to keep going: From God comes the universe. the universe explodes and is accelerating while energy is transformed to matter. Matter is inanimate and in this inanimate matter there seems to be a certain reality of relationship at its deepest level. Fast forward...Life begets plants, fish and so on until animals appear. There is a complexification of life as it develops. Man is at the top of this chain. Where is God? He is not sitting back or resting as the ancients imagined. God is at work always as Christ teaches. God is within us supporting and developing his creation. God is not in heaven above but here within his creation guiding it into fruition. But he can't hide anymore. His inner being "relatedness" as Ratzinger says is starting to be seen, and in the "fullness of time" he is united to his creation in Christ. This is how far we understand the Mystery of the Incarnation. For he is not only with us but his kingdom, that is he himself, is within us (Christ). This is partly why we as Catholics and Orthodox eat him in the Eucharist. Not only do we eat the flesh but the living flesh of Christ united with his divinity (The Body of Christ.)
With the appearance of humans there is not only complexification of life but of brain too. According to the 2009 Winter issue of "The Brain," the human brain is endowed with a neurochemical hormone called Oxytocin that is responsible for inducing social memory in humans. Oxytocin triggers the drive for social attachments. Moreover, recent studies in 2008 have shown that oxytocin is the agent for bonding between new mothers and their infants. It is also the agent that helps people find their life partners in monogmous love. The only other species that was found to carry oxytocin is the monogomous prairie voles. This leads us to contemplate the possibility that our love at the natural level is built in as much as it is a social encounter with the other. The scientific finding that oxytocin leads to a monogomous sexual life confirms what the Catholic Church has been saying for the past 2000 years. Of course, this does not at all exhaust love as a supernatural gift from God. Love of enemies is not found in any creature except in Christ's humanity and his saints. Since Original Sin, there is no other way to overcome human selfishness other than the gift of God's love which means self-emptying love.
Now we have stretched the theory of everything from the pure Mind of God to the inanimate matter to living creatures to man who is the epitome of creation fully saved in Christ. And in Christ we know there is only self-emptying love that transcends matter yet joins it in his incarnation to the divine. This is the basis of the Trinitarian God of Christians. It is the power of not only collaboration as seen in lower creatures, and not only in communication as is seen in inanimate matter, and not only in natural love as is seen in humans, but after all in self-emptying love that the Father eternally gives to his only begotten Son and his Son, accepting it in gratitude, returns it back to the Father...That binding love that is the Holy Spirit.