Psychoanalyst June Singer has written that Blake's late work displayed a development of the ideas first introduced in his earlier works, namely, the humanitarian goal of achieving personal wholeness of body and spirit. The final section of the expanded edition of her Blake study "The Unholy Bible" suggests the later works are the "Bible of Hell" promised in "The Marriage of Heaven and Hell". Regarding Blake's final poem, "Jerusalem", she writes: "The promise of the divine in man, made in "The Marriage of Heaven and Hell", is at last fulfilled."