 Morteira wrote in Spanish "Tractado de la Verdad de la Ley" (translated into Hebrew by Isaac Gomez de Gosa under the title "Torat Moshch", in 66 chapters), apologetics of Judaism and attacks against Christianity.This work (excerpts from which are given in Jacques Basnage, "Histoire de la Religion des Juifs") and other writings of Morteira, on immortality, revelation, etc., are still in manuscript.Morteira's polemical sermons in Hebrew against the Catholic Church were published, but his Portuguese writings against Calvinism remained unpublished.