view comparisons of Germanic religion with other attested Indo-European religions positively, "just as many, or perhaps even more, have been sceptical". While supportive of Indo-European comparison, Schjødt notes that the "dangers" of comparison are taking disparate elements out of context and arguing that myths and mythical structures found around the world must be Indo-European just because they appear in multiple Indo-European cultures. Bernhard Maier argues that similarities with other Indo-European religions do not necessarily result from a common origin, but can also be the result of convergence. Continuity also concerns the question of whether popular, post-conversion beliefs and practices (folklore) found among Germanic speakers up to the modern day reflect a continuity with earlier Germanic religion. Earlier scholars, beginning with Jacob Grimm, believed that modern folklore was of ancient origin and had changed little over the centuries, which allowed the use of folklore and fairy tales as sources of Germanic religion. These ideas later came under the influence of völkisch ideology, which stressed the organic unity of a Germanic "national spirit" (), as expressed in Otto Höfler's "Germanic continuity theory". As a result, the use of folklore as a source went out of fashion after World War II, especially in Germany, but has experienced a revival since the 1990s in Nordic scholarship. Today, scholars are cautious in their use of folkloric material, keeping in mind that most was collected long after the conversion and the advent of writing. Areas where continuity can be noted include agrarian rites and magical ideas, as well as the root elements of some folktales. Sources Sources on Germanic religion can be divided between primary sources and secondary sources. Primary sources include texts, structures, place names, personal names, and objects that were created by devotees of the religion; secondary sources are normally texts that were written by outsiders. Primary sources Examples of primary sources include some Latin alphabet and Runic inscriptions, as well as poetic texts such as the Merseburg Charms and heroic texts that may date from pagan times, but were written down by Christians. The poems of the Edda, while pagan in origin, continued to circulate orally in a Christian context before being written down, which makes an application to pre-Christian times difficult. In contrast, pre-Christian images such as on bracteates, gold foil figures, and rune and picture stones are direct attestations of Germanic religion. The interpretation of these images is not always immediately