The majority of us have a voice in our heads that dictates information to us. It could be a voice that prompts you to say something during a conversation, or the voice that tells you what it is that you truly want in a given situation. It is the voice that speaks to you about how you look when you look in the mirror or the voice that talks to you in terms of your self-esteem. It can be both positive and negative. This type of self-talk, when it is negative, can create a significant amount of mental clutter in our heads. When you tell yourself that a specific goal that you're trying to accomplish is impossible, it can end up actualizing a situation where you end up failing.