Thus the deepest meaning of "IS" is to be in relation.
1) The human person is the meaning of being: “Reality and truth do transcend the factual and the empirical, and to vindicate the human being’s capacity to know this transcendent and metaphysical dimension in a way that is true and certain, albeit imperfect and analogical. In this sense, metaphysics should not be seen as an alternative to anthropology, since it is metaphysics which makes it possible to ground the concept of the person’s dignity in virtue of the person’s spiritual nature. In a special way, the person constitutes a privileged locus for the encounter with being [actu essendi], and hence with metaphysical enquiry.”
2) Jesus Christ is the meaning of the human being: “In reality it is only in the mystery of the Word make flesh that the mystery of man truly becomes clear. For Adam, the first man, was a type of him who was to come, Christ the Lord, Christ the new Adam, in the very revelation of the mystery of the Father and of his love, fully reveals man to himself and brings tonight his most high calling.”
3) Benedict XVI on October 11: “God did not remain in Himself: he came out of himself, He united himself so closely, so radically to this man, Jesus, that this man Jesus is God, and if we speak about Him, we can also speak always about God. Not only was a man born who had something to do with God, but in Him was born God on earth. God came from himself. But we could also say the opposite: God drew us to Himself, so that we are no longer outside of God, but we are within the intimate, the intimacy of God Himself.
“Aristotelian philosophy, as we well know, tells us that between God and man there is only a non-reciprocal relationship. Man refers to God, but God, the Eternal, is in Himself, He does not change: He cannot have this relationship today and another relationship tomorrow. He is within Himself, He does not have ad extra relations. It is a very logical term, but it is also a word that makes us despair: so God himself has no relationship with me.
With the Incarnation, with the event of the Theotokos, this radically changed, because God drew us into Himself and God in Himself is the relationship and allows us to participate in His interior relationship. Thus we are in His being Father, Son and Hly Spirit, we are within His being in relationship, we are in relationship with Him and He truly created a relationship with us. At that moment, God wished to be born from woman and to remain Himself always: this is the great event. And thus we can understand the depth of the act of Pope John, who entrusted the Council, The Synodal Assembly to the central mystery, to the Mother of God who is drawn by the Lord into Himself, and thus all of us with Her
(Meditation of His Holiness Benedict XVI During the First General Congregation of the "Special Assembly for the Middle East" - Monday October 11, 2010)