'If this is not heaven, I do not know what heaven is, for all the suffering that can ever be put into words, could not enable anyone to earn such a reward and for ever possess it.' A central figure in Christian mystical literature, the Dominican Prior Henry Suso was the author of the seminal work The Life of the Servant. Transcribed by an enlightened amanuensis without his explicit consent, Suso began burning the manuscript until a heavenly missive...