Why was Pacem in terris addressed to all people of good will?

Pope John XXIII addressed his encyclical Pacem in terris ("Peace on Earth") to "all people of good will" because he sought to formulate a social philosophy of peace that transcended the boundaries of the Roman Catholic Church.1

By framing the document in profoundly human terms rather than strictly religious or diplomatic language, he aimed to reach a global audience, including both believers and non-believers. This inclusive approach allowed him to emphasize the necessity of peaceful coexistence between the West and the communist East during the Cold War, arguing that such cooperation was essential for the survival of humankind. Ultimately, his decision reflected his desire to act as a reconciler and his belief that the church should serve as a suprapolitical spiritual force dedicated to the common good of all humanity.21