The world is an interlaced web of life. Energy flows from one thing to another and back again in a cycle that is both spiritual as well as physical. While this cycle is often represented by the cycle of birth, life, death, and rebirth, there is also another aspect at work. The world is tied together in an intricate dance of energy and power, taken from one source, given to another, and sent along through the web of life. This has been shown with the flows of electrical, solar, and magnetic energy. Energy slides into the cycle from the sun, driving growth and expansion. This potential is turned into mechanical, chemical, and biological energy. It returns to the cycle as it flows out of the living once again.
Given the idea of the birth/death cycle, look at the creation of a living being. Using nothing but the energy supplied through that stored in food, two cells become four which become eight and so on until life springs from the womb. This cycle has existed and been venerated since before humanity came down from the trees. As we walk through life, we can sometimes feel that force ripple through as we look at a pregnant woman, a field of growing food, or trees reaching for the sky. Our ancestors venerated this force as a life giving entity. Even science gives laude to the forces that take solar energy, turn it into caloric energy, and then into life.
From a spiritual point of view, this energy permeates all life, giving it the impetus to move, to live, to exist. Scholars have explained it as ley lines, meridians, Chi, places of power, holy sites, etc., and those places where the feeling of life and energy bubble up. Even outside of them though is the feeling that a life force ebbs and flows through the earth, barely outside of our ability to see or feel. In places where life thrives such as the forests or grasslands, it is sometimes easier to feel. Even so, the energy flows through the deserts and icy tundra also.