Your perceptions affect your reality and your experience of the world.
Go to a homeless shelter infected with bed bugs, or to a school with an outbreak of lice.
Just being there, I bet you start to feel itchy. You might even be feeling itchy just thinking about the possibility of getting bed bugs or lice.
What you think and what you perceive to be true (even though it probably isn't) affects how you feel and how you interact with the world around you. It affects your every action.
What happens when you think you are more important than others around you?
What happens when you are angry? When you are worried? Stressed?
Need we even mention those who are racist, bigoted or ignorant?
If you feel itchy because you perceive the possibility of beg bugs near you,
or if you feel that the world is always fighting you because you perceive your situation to be right,
the only way to fix the problem is to correct your perception.
You need to train your mind.