In man’s present situation, the dialogue of religions is a necessary condition for peace in the world and it is therefore a duty for Christians as well as other religious communities. This dialogue of religions has various dimensions. In the first place it is simply a dialogue of life, a dialogue of being together. This will not involve discussing the great themes of faith – whether God is Trinitarian or how the inspiration of the sacred Scriptures is to be understood, and so on. It is about the concrete problems of coexistence and shared responsibility for society, for the state, for humanity. In the process, it is necessary to learn to accept the other in his otherness and the otherness of his thinking. To this end, the shared responsibility for justice and peace must become the guiding principle of the conversation. A dialogue about peace and justice is bound to move beyond the purely pragmatic to become an ethical struggle for the truth and for the human being: a dialogue concerning the values that come before everything. In this way what began as a purely practical dialogue becomes a quest for the right way to live as a human being. Even if the fundamental choices themselves are not under discussion, the search for an answer to a specific question becomes a process in which, through listening to the other, both sides can obtain purification and enrichment. Thus this search can also mean taking common steps towards the one truth, even if the fundamental choices remain unaltered. If both sides set out from a hermeneutic of justice and peace, the fundamental difference will not disappear, but a deeper closeness will emerge nevertheless.
Two rules are generally regarded nowadays as fundamental for interreligious dialogue:
1. Dialogue does not aim at conversion, but at understanding. In this respect it differs from evangelization, from mission;
2. Accordingly, both parties to the dialogue remain consciously within their identity, which the dialogue does not place in question either for themselves or for the other.
— from Christmas Greetings to the Roman Curia (December 21, 2012)