Nonresistance is the key to the greatest power in the universe. Through it, consciousness (spirit) is freed from its imprisonment in form. Inner nonresistance to form—whatever is or happens—is a denial of the absolute reality of form. Resistance makes the world and the things of the world appear more real, more solid, and more lasting than they are, including your own form identity, the ego. It endows the world and the ego with a heaviness and an absolute importance that makes you take yourself and the world very seriously. The play of form is then misperceived as a struggle for survival, and when that is your perception, it becomes your reality.
The many things that happen, the many forms that life takes on, are of an ephemeral nature. They are all fleeting. Things, bodies and egos, events, situations, thoughts, emotions, desires, ambitions, fears, drama... they come, pretend to be all-important, and before you know it they are gone, dissolved into the no-thingness out of which they came. Where they ever real? Were they ever more than a dream, the dream of form?
Eckhart Tolle, A New Earth: Create a Better Life