Prior to the Six Day War, he wrote in Haaretz: "It is more than the Strait of Tiran that is at issue now. What is at issue is the existence or nonexistence of the Jewish people. We must crush the machinations of the new Hitler at the outset, when it is still possible to crush them and survive. ... Neither the world nor the Jews believed in the sincerity of Hitler's declarations. ... Nasser's fundamental strategy is the same as Hitler." After the war, he was one of the founders of the Movement for Greater Israel, in which he was active for the rest of his life. His last book, Israel and the Crisis of Western Civilization promoted a return to original Jewish culture instead of the Western one. His book On the Road to Elon Moreh—Zionism on the path of Emunim was released posthumously by Gush Emunim publishing.
