Dualistic nature of Earth

Life on earth is dualistic by nature, meaning that it appears to have polar opposites such as good and bad, hot and cold, dark and light, here and there, etc. Duality has a specific function within life, which is to create a framework within which we may make choices between one thing and another. Duality then, facilitates choice, and by it's nature is a representation of two different vibrational rates, or "extremes."

The Pocket Guide To The Law Of Attraction: Blain Tomlinson
Book:
http://www.smashwords.com/books/view/166443 

https://itunes.apple.com/us/book/pocket-guide-to-law-attraction/id567956080?mt=11