In Egyptian belief, the feather of Ma'at symbolizes truth, justice, and cosmic order in the afterlife. During the weighing of the heart ceremony, a deceased individual's heart is measured against Ma'at's feather. If the heart is lighter, it signifies a life lived virtuously, warranting entry into the afterlife. This belief emphasizes the importance of morality and ethical behavior, reflecting the deeper connection between one's actions in life and their consequences beyond death in Egyptian mythology.