Three decades after his untimely death, the theological and ecumenical legacy of Nikos Nissiotis remains unprecedented and undiscovered. At a time when global society and Christianity face unforeseen challenges in society and politics, science and technology, as well as the rise of religious nationalism and radicalism, Nissiotis’ theological voice, founded on the spirit of dialogue, offers a vibrant interpretation of Church teaching as well as a timely reflection on ecumenical relations.

Nikos Nissiotis served for many years as Director of the Ecumenical Institute in Bossey and was the Orthodox voice in the World Council of Churches in Geneva. In ecumenical conferences throughout the world, he was capable of communicating the Orthodox response to questions of common interest in a clear, coherent, and comprehensible manner. We miss this extraordinary Greek theologian in the global dialogue of Christianity, and we will never forget his theology of “paschal joy.”

Jürgen Moltmann

Nikos Nissiotis was a landmark for modern Greek theology, representing a “different” kind of theologian, scholar, and professor, while relating the language of theology with the immediacy of experience. For Nissiotis, theology preserved and integrated the exciting realism of existential value without any trace of intellectualism. His teaching sustained the freshness of vibrant reflection, transcending the delusion of narrow-minded introspection. He refused to divorce theology from philosophy, perceiving theology as a source and inspiration of vitality and delight.

Christos Yannaras, Professor Emeritus, Panteios University of Political Science

Nikos Nissiotis was among the first to open the eyes and ears of Christians from other traditions to the theological and spiritual treasures of the Orthodox Church. As Director of the Ecumenical Institute Bossey and as Moderator of the Commission on Faith and Order of the World Council of Churches, he has left a profound mark on the ecumenical movement.

Konrad Raiser, Former General Secretary, World Council of Churches