 For them, "magia" was viewed as an elemental force pervading many natural processes, and thus was fundamentally distinct from the mainstream Christian idea of demonic magic.Their ideas influenced an array of later philosophers and writers, among them Paracelsus, Giordano Bruno, Johannes Reuchlin, and Johannes Trithemius.According to the historian Richard Kieckhefer, the concept of "magia naturalis" took "firm hold in European culture" during the fourteenth and fifteenth centuries, attracting the interest of natural philosophers of various theoretical orientations, including Aristotelians, Neoplatonists, and Hermeticists.