Blake was a visionary like no other. To some, like William Wordsworth, the only explanation for the remarkable spiritual world Blake witnessed and brought to life in his books was 'insane genius'. Although such a view persisted well into the twentieth century, this is the pivotal work which challenged that perspective and changed forever our understanding of William Blake's genius, placing him in the esoteric tradition. For many this book will be a revelation; for lovers of Blake it is indispensable.