A woman with elevated mood believes both that she has been specially chosen to write the definitive theory unifying physics, and that a famous physicist she has never met is secretly in love with her and communicating this through television interviews. Which of these two beliefs is the grandiose delusion?

The belief about being specially chosen to write a unifying theory of physics is the grandiose delusion: a fixed belief in possessing exceptional ability or importance. The belief that the physicist is secretly in love with her is a delusion of love: a fixed belief that a specific other person, with no real relationship to her, secretly reciprocates romantic feeling. The two frequently co-occur, as here, and as grandiose delusion's own distinguishing features note, may form part of one broader elaborated delusional picture — but they are separable by content: exalted ability/status/importance versus a specific person's secret romantic feeling.