In 1937, the Guild of Pastoral Psychology was established in London to encourage the study of psychology among clergy and other spiritual leaders, with particular reference to Jung�s work. In 1939, its patron, Jung, delivered this lecture, in which he stated that "Only the symbolic life can express the needs of the soul." The guild�s website explains the cover logo: �The chalice symbolises the great womb of life. The opposites meet in all their variety and fecundity and are contained until they transform. It is the female and maternal giving birth to life. The snake is that symbol of regeneration because it casts away its old skin, burnt in the fiery tension between opposites, and a new form emerges.�