Rav Kook's own record of his derashot (talks) over a span of two years, 1894-1896. this book, which should have been his literary debut, is the last of his works to appear in print. The reason for the delay, is that the manuscript disappeared in mysterious circumstances. The book may have arrived a century late; its message is uncannily timely.
Besides their visionary quality, Rabbi Kook's talks are remarkable for their encyclopedic knowledge. A typical derasha will start with a verse in the Torah or passage in the Midrash. From there, Rabbi Kook weaves a rich tapestry encompassing the breadth of Jewish literature: Bible, Talmud, philosophy, and Kabbalah.