When an idea constantly bypasses your conscious mind's filters to your subconscious it may turn into a belief, you may be asking how can an idea bypass my conscious mind filtering, the following are explanation of how could this happen:
When the idea comes from a trusted source: when you were a small child the most trusted source you knew at that time was your parents, if your parents told you that this barking animal is called a dog will immediately believe them, and since you will find that everyone around supports this idea, the idea is will become a strong belief then turn into a known fact.
Now what if your parents kept telling you that you were a fool or a dumb kid? What will be the result? Of course you can guess, you will grow up thinking that is true, and you may end up feeling inferior and lacking self confidence.
Belief system and your life
What’s most dangerous about your beliefs is that they shape your life; you may even create a self-fulfilling prophecy to support a false belief that you have about yourself.
For example suppose you think that you are not good at math, most probably you wont be motivated to study math because you will be thinking that whatever you do you wont get good grades, and the result will be that you will perform poorly in the exam and so reinforce the belief!!!
That was a simple belief, in some cases beliefs totally ruin people's lives, like when someone thinks that he is a failure and so fulfill the prophecy and fail or like when someone thinks that he is a victim and so act like one or like when someone thinks that he is worthless and so commit suicide!!
Law governs the universe
Law governs success
Law also governs your subconscious mind.
The law of your subconscious mind is the law of belief.
Your subconscious mind power is like a magnet. It attracts things that resonate with its beliefs. To put it bluntly, if you have a certain belief in your subconscious mind, your subconscious mind will vibrate based on this belief and attract events and people that resonate with or correspond to this belief. This is the Universal Law of Vibration and Attraction. It is a law that exists whether you believe it or not, just like the law of gravity. Let me repeat. This law works on you whether you believe it or not! – Soul and Peace