Water characterizes change and represents the liquid state. Water is necessary for the survival of all living things. A large part of the human body is made up of water. Our blood, lymph, and other fluids move between our cells and through our vessels, bringing energy, carrying away wastes, regulating temperature, bringing disease fighters, and carrying hormonal information from one area to another. Water is a substance without stability.
Fire is the power to transform solids into liquids, to gas, and back again.
In other words, it possess power to transform the state of any substance. Within our bodies, the fire or energy binds the atoms together. Fire transforms food into energy. It creates the impulses of nervous reactions, our feelings, and even our thought processes. Fire is considered a form without substance.