Hypnosis Rule #5: Once an idea is accepted by the subconscious mind, it remains until it is replaced
The companion rule to this is: The longer the idea remains the more opposition there is to replace it with a new idea.
Once an idea has been accepted, it tends to remain. The longer it is held, the more it tends to become a fixed habit of thinking. This is how habits of action are formed, both good and bad. First there is the thought and then the action. We have habits of thinking as well as habits of action, but the thought or idea always comes first. Hence it is obvious if we wish to change our actions we must begin by changing our thoughts. We accept certain facts as true. For example, we accept as true that the sun rises in the east and sets in the west, and we accept this even though the day may be cloudy, and we cannot see the sun. This is an instance of a correct fact conception which governs our actions under normal conditions. However, we have many thought habits which are not correct and yet are fixed in the mind. Some people believe that at critical times they must have a drink of whiskey or a tranquilizer to steady their nerves so that they can perform effectively. This is not correct, but the idea is there and is a fixed habit of thought. There will be opposition to replacing it with a correct idea.
Now in advancing these rules, we are speaking of fixed ideas, not just idle thoughts or passing fancies. We need to alter fixed ideas or use them. No matter how fixed the ideas may be or how long they have remained they can be changed with hypnosis and suggestion therapy.