The Four Seals of the Dharma: (1) All phenomena are impermanent. In other words, they change. (2) All existences are without a self; they do not have an unchanging essence. (3) Nirvāṇa is quiescent. The state that is without delusion is peaceful and tranquil. (4) All phenomena are suffering. …

Five Aggregates: Five accumulations that are the elements comprising the world of phenomena. (1) Form: All matter. (2) Feeling: The sensory functions. (3) Perception: The unified functioning of the sensory organs. Imagination. Perceiving that which is reflected in one’s mind. (4) Volition: Connecting representations and internal consciousness. The power of formation. (5) Consciousness: Unifying all the functions of consciousness. Self-reflective awareness.

No-self: The insight that a self does not exist on an absolute level. One of Buddhism’s basic theories regarding the perception of reality.