The theme of development can be identified with the
inclusion-in-relation of all individuals and peoples within the one
community of the human family, built in solidarity on the basis of the
fundamental values of justice and peace. This perspective is illuminated
in a striking way by the relationship between the Persons of the Trinity
within the one divine Substance. The Trinity is absolute unity insofar as
the three divine Persons are pure relationality. The reciprocal
transparency among the divine Persons is total and the bond between each
of them complete, since they constitute a unique and absolute unity. God
desires to incorporate us into this reality of communion as well: “that
they may be one even as we are one” (Jn 17:22). The Church is a sign and
instrument of this unity[131].