The Rule of St. Benedict, for which Fr. Isaac wrote the Preface, was translated into Modern Hebrew by Father Gabriel Grossmann, O.P., under the auspices of Tel Gamaliel and published in 1980. After he came to Israel, Father Isaac Jacob wrote and gave lectures in Israel, the United States, Ireland, and Germany. Among his seminal articles are: “Israel, History, and the Church,” America, 1970; “The Rule of Benedict, Bridge to Israel,” American Benedictine Review, 1994.

Father Isaac, in his deep desire to share the Word of the Lord, Torah and Gospel, wrote hundreds of sermons. These are carefully kept in a box in the library at the Benedictine Monastery, Saint Mary of the Resurrection Abbey, in Abu Ghosh, Israel. These and other documents are waiting to be read and edited for possible publication.