In the biblical perspective, life in its maximum expression is divine life, the man who properly lives is the one who is united to God, the one who lives according to God. Here we could evoke the idea of St. Irenaeus († 202): "gloria Dei vivens homo", which could be freely translated as the life of man is the glory of God, or also that the living man is the expression of the glory of God. 

Man lives more perfectly the more he participates in the love and knowledge that God himself has. Thus, in the nobility of this life, God is more known and loved. The greatness of authentic human life leads to extolling and praising its Creator. This is called "the glory of God". 

For this reason, it can be affirmed that it is biblical faith that best ensures the dignity of the human person. the dignity of the human person, insofar as it reveals that the human person has been created in an unrepeatable way by God and redeemed by Jesus Christ.

Instead, as the encyclical says Lumen fideiLumen Fidei, "when this reality is obscured-the reference letter of man's dignity to God-there is no criterion for distinguishing what makes man's life precious and unique. Man either loses his place in the universe, loses himself in nature, renouncing his moral responsibility, or pretends to be the absolute arbiter, arrogating to himself an unlimited power of manipulation" (n. 54).

Or again, in other words, "when faith is extinguished, there is a risk that the foundations of life will weaken with it" (Ibid., n. 55).

The English poet T. S. Eliot, a witness to the Christian roots of our Western society, had already warned of this:

"Do you perhaps need to be told that even those modest achievements / that allow you to be proud of polite society / will hardly survive the faith that gives them meaning?" (Choruses from "The Rock").

At final, the value of human life, accessible to reason, is confirmed by the Christian faith. It assures us that divine life is source of all life, and particularly of human life, endowed with intelligence and will, in the image of its Creator.

That is why we aspire to a full and infinite life which can only be found beyond earthly existence, and which, according to Christianity, can be initiated already now to the extent that one lives out of love for God and for others.

All this is the ultimate foundation of dignity staff, which, according to experience, is only assured when God is present in society and is not expelled from it.