Hamingja is taken directly from Old Norse. It is the luck, potency, and spiritual fortune that both birthed you and radiates from you as you live.
In its first sense, hamingja is the Wyrd or karma that caused causality to bring you into being — the accumulated spiritual and physical realities of your ancestral line that bestowed upon you your nature, your gifts, your temperament. It is your family karma, the inheritance that shaped you before you had any say in the matter. In this respect, hamingja corresponds closely to the Daoist concept of dé 德 from the Dàodéjīng: the innate virtue or potency that lies beneath your true self, which is both given to you and cultivated by you.
In its second sense, hamingja is what you make of your life. As you live, as you act with integrity and align your words with your deeds, your actions radiate outward through the Yarn of reality and shape the world around you. This too is hamingja — the way your practice and your presence affect everything they touch. The Old Norse understood hamingja as something others could feel: warriors would switch sides mid-battle to follow someone whose hamingja burned brighter. It was said to be impossible to fake, because it was not a performance but the natural radiance of a person living in alignment with their doom.
Hamingja grows through honest living — through courage, through the alignment of intention and action, through the cultivation of Will. It shrinks through dishonesty, cowardice, and the misalignment of word and deed. And when you die, it passes on to your descendants. In this way, hamingja connects past, present, and future into a single thread: the luck your ancestors deposited, the life you live now, and the inheritance you leave behind.