There are many sefarim which explain the laws of all the mitzvos, but the inner world is not explained clearly. In our times especially, there are many sefarim about each of the details of all the mitzvos, and they are written clearly. In contrast to this, the information about the inner world is scattered throughout the writings of the Sages, in the Talmud and in the Midrashim, and in the works of the Rishonim, but it is not concentrated into any one volume. No one has ever written a clear “Shulchan Aruch” (Code of Jewish Law) about the inner world and what man’s internal obligations are.