Rav Kook (1865-1935) was one of the most influential thinkers in Jewish history, but his revolutionary writings are, for the most part, unknown to the general public. This book contains many new and accessible translations, as well as a profound spiritual biography. Each chapter is presented and divided into a variety of topics, including the individual, the Torah, God, teshuvah, prayer, creativity, Zionism, science, and vegetarianism.