The experience of
World War II, awareness of
antisemitic prejudice within his own confession, deepened his reflections, stirring an interest in his Jewish
converso origins, He encountered considerable difficulties with the
Latin Catholic Hierarchy of the Holy Land, whose members were predominantly of Arab origin, and assisted in the establishment of the St. James Association to cater to the minority of Jewish Catholics, a year later, on 14 December 1954, who were viewed with suspicion by Palestinian Catholics and marginalised by Israeli Jewish society. At the same time, he undertook pastoral care of the
Jaffa Arab Catholic congregation, which deepened his awareness of the complexities of life for the Arab population in Israel. In 1959, together with
Brothers Jacques Fontaine and
Marcel-Jacques Dubois, he opened St. Isaiah House, the aim of which was to foster dialogue and prayer between Christians and Jews. He obtained secret permission from the Vatican to have a Jewish wedding celebrated before the Catholic wedding was performed in 1960. He participated, with the support of
Cardinal Bea in the work of the
Second Vatican Council, where he helped draft the document,
Decretum deo Iudaeis, which was to mark an important turning-point in
Jewish–Catholic relations He greeted the reunification of Jerusalem subsequent to Israel's victory in the
Six-Day War with joy, as a mark of
eschatological significance and he became more markedly
pro-Zionist, defining himself as a Christian, Jew and loyal citizen of the State of Israel. Israel's annexation of East Jerusalem, together with its occupation of both the
West Bank and
Gaza spurred Hussar with a sense of urgency to develop a process of reconciliation that would unite Jews, Christians and Muslims. This vision, according to Chiara Rioli, is to be distinguished from that of most
Christian Zionist evangelical advocates like
John Hagee, in that the event is not understood to foreshadow the
apocalyptic Second Coming of Christ. He originally proposed setting up a new interfaith centre, an "oasis of peace" modelled on the
kibbutz, on the slopes of
Kiryat Ye'arim by
Abu Ghosh, but decided to settle on larger grounds, some , owned by the
Trappist order of the
Latrun Abbey, on
no man's land according to the
1949 armistice lines, and equidistant from the three cities central to Judaism, Christianity and Islam, of
Jerusalem,
Tel Aviv and
Ramallah, implying thereby the 'equal proximity to the
three Abrahamic religions of the
Holy Land. ==Identity==