" The trick is to think of life as a process rather than a substance. When a candle is burning, there is a flame that clearly carries energy. When we put the candle out, the energy doesn’t “go” anywhere. The candle still contains energy in its atoms and molecules. What happens, instead, is that the process of combustion has ceased. Life is like that: it’s not “stuff”; it’s a set of things happening. When that process stops, life ends. "

― Sean Carroll , The Big Picture: On the Origins of Life, Meaning, and the Universe Itself