The author argues that consciousness may never be defined or explained with entities or their properties, neither with brains, neurons, and biomacromolecules, nor with particles, waves, and fields. Instead, the author proposes a system with matter, energy, and lives as its components, and with all its components defined as changes. Based on the systematic relationships among these three components, a triple definition or explanation of consciousness is reached: • Ontologically, consciousness is universal, since it is the systematic distinction between matter (...) and energy. • Epistemologically, consciousness is unique, since it is the energy systematically formalized, qualified, or diversified by the matter. • Semantically, consciousness is a meaningless language with lives as its only meaning. In other words, only lives are, but consciousness is not, the cause or effect of mental activities. From this definition or explanation, the author deduces that consciousness is the same as action, but not the same as mental states, especially not the same as the experiences of a unique self in its unique world. Therefore, the author argues that many theories of consciousness have explained something other than consciousness itself. (shrink)