What is a belief? Often in life people talk about things with no clear idea of what they really are. It is common for people to view belief as though it is a thing, a tangible quantity that you can physically hold, when in fact it is a feeling of certainty.
If you say that you believe that you are clever, what you are really saying is that you are certain of this fact, you feel certain that you are clever. This feeling of certainty allows you to tap into your inner resources that allows you to produce results that mirror that belief.
An easy way of beginning to understand belief is to think about the foundations that make up an idea. There are numerous idea's you might have every day, but don't really buy into with any real conviction or belief.
Let's take the idea of being attractive. You could say to yourself right now, 'I am attractive.' Whether or not you believe this statement on the other-hand is a different matter and involves the certainty you affix to that idea.
So what will turn our idea's into beliefs? To use the example of being attractive, if you have the idea that you are attractive what will give this certainty are experiences that support that idea. Experiences that will support the idea and therefore give it certainty.
Say for example you receive lots of attention in the street or have been told by more than one person that you are indeed attractive. These will build certainty and a belief around the idea and support the notion that you are attractive.
So you see building positive beliefs about yourself will require you to be certain that those beliefs are true. So how do we go about that? By building enough reference points to support the idea and thus concreting it as a certain.