I routinely return to my favorite ontological hobby horse, the ideas surrounding Idealism, specifically Subjective Idealism, and reading round again landed me on Persian philosopher, scientist, and physician Ibn Sina (aka Avicenna), a philosophical giant of the Middle Ages. The essays in this collection cover many of his core ideas concerning the necessity of being and chains of causation, those big philosophical trends of medievalism, Thomas Aquinas type discussions (a lot of Aquinas’s stuff was borrowed from Ibn Sina). I’m less interested in these thoroughly drubbed and insanely complicated ideas, but I am intrigued by the differences in Ibn Sina’s thoughts concerning the ultimate rational consequences of medieval style idealism - mainly his reaching toward Occasionalism. Landing here seems to me a much more elegant and intellectually honest enterprise, and like George Berkely’s Immaterialism, I find Ibn Sina’s full commitment to the natural consequences of a belief in Idealism to be simultaneously reassuring and overwhelming in its implications. Another sublime idea explored here is the importance of learning as nourishment for the soul. An oversimplification: Ibn Sina posits that the purpose of our earthly lives, which are temporary instruments of our immaterial (yet rational and thinking) souls, is active learning and intellectual growth. The purpose of life is to learn to think better, a challenging charge. Earthly life is school for the soul, what you learn before your death is all you’ll have to work with for eternity. Will you walk the stage with just enough credits, or graduate summa cum laude?