THE NEGATIVE
Your brain doesn't see the negative connotation.
Like if you repeat to yourself : "I'm not scared, I'm not scared, I'm not scared" your brain will only understand "I'm scared, I'm scared, I'm scared".
So it's really important to feed your brain with positive instead " I'm fearless, I'm courageous, I'm brave".
As I said in an earlier post, words are spells that you cast into the universe and the universe gives you back what you tell it. It acts like a magnet.
So speak and think positive and positive things will happen. The opposite is also true.