Cause and effect is not a theory or a belief, it is a law. As a law, it does not matter if you have heard of it, believe in it, or ignore it. Everything about you is subject to the law of cause and effect.
Even gravity is a minor law in comparison with cause and effect. A few miles above the surface of the Earth, the power of gravity begins to fade. Yet cause and effect has no such boundary. It manages every existing thing, on every level, from the subatomic to universes.
Excerpt from Karma is Negotiable, Nikias Annas