Polarity
You may have already lived a moment in your life where you hated someone and where you began to love him/her with the same intensity, or vice versa; it was an application of this principle the ancient Egyptians were aware of!
Everything has two poles, everything has two extremes. The two poles, although they are extremely different, are in fact exactly the same because they are on the same scale, but at different levels. This is why cold and hot, although they seem very different, simply indicate the temperature. They are the same thing. The difference is only the level of vibration. We cannot say where darkness ends and light begins. These are always different levels of presence of both.