Sometimes these beliefs are so ingrained within us that won't allow us to accomplish everything we want in our lives, in certain way they become obstacles that put constraints without us being aware of it, as are beliefs that exist in our subconscious.
A clear example of beliefs which prevent us from achieving our goal to be rich for example, is the belief that the majority of millionaires made their money in a way not honest, how many people you know that the first thing they say when they see a millionaire on TV or in the newspaper is that probably they made their money in a not honest way. Surely this has happened to you or even think so, this is because when you were a child you were taught things that were shaping your beliefs that way.
And these beliefs do not allow you to believe you can be rich, or achieve what you really want in life. I read a lot on this subject of beliefs, mostly because we all have this kind of beliefs that will not let us move forward, so I include myself, and I tried to find ways to modify these beliefs, and one of the things that has really helped me was "the script", written in the book the Feelings Buried Alive Never Die by Karol Truman.
This script will allow you to release a belief or feeling that you no longer want and replace it with something you prefer.
All you have to do is say, inserting into the empty places the beliefs you want to change and then put the beliefs you want to feel to accomplish your dreams: