Hieronymus Bosch left behind himself no correspondence or diaries, and not anything is identified of his character or his feelings on the significance of his paintings. His birthday has not been determined with confidence. He not at all dated his works and may have signed only few of them. In the past it was habitually supposed that Bosch's paintings was inspired by medieval heresies. In the 20-th century, researchers have come to sight Bosch's vision as fewer unbelievable, and acknowledged that his art reflects the conventional religious faith systems of his time. His images of sinning people, his view of Heaven and Hell are now perceived as consistent with late medieval didactic literature. It is in the main acknowledged that Bosch's art was produced to educate exact moral and spiritual norms, and that his images provide precise worth. Nerveless, some critics notice Bosch as example of medieval surrealist, and parallels are repeatedly made with the modern Spanish artist Salvador Dali.