Answer: Baal HaSulam lived a hundred years ago when the world had not heard yet about what the wisdom of Kabbalah is. Until that day, Judaism was in a state of stagnation and constantly denied and opposed the wisdom of Kabbalah. He wanted to rouse the sleeping world, especially before the Second World War, before the Holocaust. So in the twenties and thirties of the last century he wrote articles for the people and in 1940 he published the newspaper The Nation.
He planned to produce fifty pamphlets, each one which would include five articles. But he only managed to publish the first journal, which contained the articles, “Matan Torah (The Giving of the Torah),” “The Arvut (Mutual Guarantee),” “Peace in the World,” “The Peace,” and another article. After that, they closed his small publishing house and he said that he would not write any more because the world was not ready yet for this. We can only imagine how much we lost.
From the Kabbalah Lesson in Russian 2/28/16