From angels and the afterlife to suffering and Divine providence, The God Book addresses all things spiritual through classic works of Jewish philosophy. Works summarized include the Rambams Moreh Nevuchim (Guide for the Perplexed), Ramchals Derech Hashem (Way of God), ibn Pakudas Chovos HaLevavos (Duties of the Heart) and Hilchos Deios from the Rambams Mishneh Torah.