The Inner Nature of Man and the LIfe Between Death and a New Birth 1914, a cycle of 6 lectures by Rudolf Steiner. Given in Vienna April 9 - 14, 1914 (CW 153). CAUTION: This is an old translation and very probably not the one you may have as a purchased text. However, there is a newer translation of this that can be obtained at steinerbooks and here is the URL:
https://steiner.presswarehouse.com/Books/BookDetail.aspx?productID=368537