There is a legend that the young Jesus went to England with his uncle, Joseph of Arimathea, to England and visited Glastonbury. The poem connects this legend to an idea in the Book of Revelation ( 3:12 and 21:2) describing a Second Coming in which Jesus builds a new Jerusalem. Some Christians thought that a new Jerusalem would be like Heaven, somewhere of love and peace. The poem asks if Jesus visited England and if Heaven was created in England. Blake lived in the time of the early Industrial Revolution when there was a lot of poverty and misery. Many people think the “dark Satanic mills” were the factories where many people worked in horrible conditions. This contrasts with the country with its beauty and clean air: “England’s green and pleasant Land”. The second half of Blake's poem says people should try to establish "Jerusalem" once more.