According to a common Heathen belief based on references in Old Norse sources, three female entities known as the Norns sit at the end of the world tree's root. These figures spin "wyrd", which refers to the actions and interrelationships of all beings throughout the cosmos. In the community, these three figures are sometimes termed "Past, Present and Future", "Being, Becoming, and Obligation" or "Initiation, Becoming, Unfolding". It is believed that an individual can navigate through the wyrd, and thus, the Heathen worldview oscillates between concepts of free will and fatalism. Heathens also believe in a personal form of wyrd known as "". This is connected to an emphasis on luck, with Heathens in North America often believing that luck can be earned, passed down through the generations, or lost.