Pacem in Terris §4

Pacem in Terris: On Establishing Universal Peace in Truth, Justice, Charity, and Liberty

⁴ And yet there is a disunity among individuals and among nations which is in striking contrast to this perfect order in the universe. One would think that the relationships that bind men together could only be governed by force.

Read in full at Vatican.va

Source: Pacem in Terris (Vatican.va)