Duality means - "Simultaneously holding two or more contradictory beliefs, ideas or values". In my opinion, you can't just have contradictory beliefs. It's like you are saying that you are a Christian, but also you worship satan sometimes. You simply must choose.
First of all, when you are a young, you will face both good and bad. It is a law that states:
A person will first see the good and bad in everything. After observing it he must choose whether he will follow the one or another.
It is as simple as that. You do have a good and a bad side. But you can choose which one to feed. A problem arises when you can't tell what is good and what is bad. Sometimes the bad is so shiny looking that you misjudge it as good. You must double check.If something looks good and innocent it doesn't mean that it is.
Freemasonry and dualism.
Freemasons believe in dualism. They have a special symbol for it. It is the black and white checkerboard floor.
In the image above we can see the symbol used. All of the Masonic temples have black and white checkerboard floors. The funny thing is that this dualism is just a cover-up. The Masons actually believe in lucifer, but only the high degree masons know this. So they are using this "innocent" symbol just so they can bring more people in. You can not believe in dualism and satanism at the same time.
We are being deceived
Satan is the master of deception. So he will trick you in any way possible. He wants you to believe that there must be evil so there to be good. It means that if satan wasn't alive there wasn't going to be Jesus. That is incorrect in many ways. We know what evil is simply because there is evil in the world.
Thank you for reading.
God Bless.