8 lectures, Berlin, May 29-July 24, 1917 (CW 176)How to Keep Your Soul Alive after Twenty-Seven This could have been the title of this book. The author shows that the natural development of the soul stops at around the age of twenty-seven. After that, nothing happens for our inner being unless we learn to make it happen. Part of the tragic nature of our time is that more and more people allow their soul life to die at twenty-seven, so that the remainder of their life becomes a kind of mummification. Steiner explains how, by exerting our thinking and feeling, we can keep our soul alive and growing. This is ultimately the only way we can make this incarnation a satisfactory one. Through such effort, we can continue to develop inwardly until a very advanced age--each year, becoming richer and more interesting than the one before.Aspects of Human Evolutionis a book that gives real meaning to the idea that we live in a state of becoming!This book is a translation from German of Menschliche und menschheitliche Entwicklungswahrheiten. Das Karma des Materialismus (vol. 176 in the Bibliographic Survey).