(also called the Law of Sowing and Reaping)
The Law of Karma is essentially the Law of Delayed Energetic Response. It states that the Energetic Vibrations you exude and the actions you take will eventually come back to you in like manner.
As we interact in the world, we are constantly sowing our seeds. Over time, we will harvest the seeds we plant.
It may seem that the world is not responding to us, but it always does, eventually. With every interaction, with plant and nurture the seeds of our future reality.