The Marriage of Heaven and Hell is an illuminated work by William Blake, composed around 1790–1793. Combining prose, poetry, aphorisms and symbolic visions, it challenges conventional distinctions between good and evil. Blake argues that contraries such as reason and energy are necessary to human existence, and he questions religious systems that treat desire, the body and creative energy as inherently sinful.

The work includes the well-known “Proverbs of Hell”, a series of provocative sayings that overturn familiar moral assumptions. Blake also satirises the theologian Emanuel Swedenborg and reinterprets biblical and Christian imagery through his own imaginative mythology. Heaven and Hell are presented less as simple realms of reward and punishment than as symbols within a larger argument about human perception and spiritual freedom.

Across the work, Blake presents imagination, energy and opposition as central forces in intellectual and spiritual life.