"Expression in the Life of Religion through Symbols and Concepts" delivered as part of the Marjorie Otis Memorial Lectures in Religion, 1961, https://s3.amazonaws.com/gebbie.archives/Otis_Lecture_Paul_Tillich1_a.mp3. Marion B. Gebbie Archives and Special Collections. https://wheatoncollege.as.atlas-sys.com/repositories/2/digital_objects/1487 Accessed May 10, 2024.