The law of polarity states that everything in the universe has an opposite. There is no up without down, there is no hot without cold and there is no light without darkness. For everything that exists, there is a pole which measures varying degrees of that particular element.
Revisiting science once again, we remember that all matter in the universe is made up of atoms. Once thought to be the smallest unit of matter, we now know even atoms are made up of protons, neutrons and electrons. In fact, atomic structure is the perfect representation of the law of polarity. The law of polarity can simply be represented by a spectrum. At both ends of the spectrum are the polar opposites - light and dark, hot and cold, etc. In the middle lies neutrality. Inside an atom (the building block of all matter) we have the proton (positive), the electron (negative) and the neutron (neutral).
Just think about the last time you tried to pick out a paint color and stared at a wall of paint chips. For every color that exists, there is a spectrum ranging from a very dark shade to a very light shade. There are even colors like ultra violet which we can't see with the human eye, but they exist.
So what do we do with the law of polarity? We use it like a compass to guide us on the right path to the right thoughts and the good life we deserve. If we are experiencing circumstances that are not ideal or feelings that make us feel disharmonious, we can know with absolute certainty that according to the law of polarity there has to be an exact polar opposite to our current experience. For every negative experience we perceive there is either:
a.) another positive experience waiting for us
b.) there is something positive we can somehow glean out of the perceived negative.
Perhaps the most powerful aspect of the law of polarity is in recognizing that for every negative thought or emotion we experience, there is a polar opposite which we could just as easily be experiencing. All we have to do is shift focus back to the other end of the spectrum. The law of polarity helps us redirect our course in life and serves to let us know that there is always an alternative. If we never experienced failure, we could not know and fully appreciate the success. If we did not know hunger or want, we would not know the satisfaction of fulfillment. Like the law of relativity, without knowing our circumstances could be perceived as much worse, we would not know how good we have it already.