We spend a lot of time during the day with these types of unnecessary thoughts. They are leaks of energy that weaken us. We have created the habit of thinking like that and, therefore, it is in our hands to learn to change it. We can free ourselves of these dependencies and the result is to be freer, mentally, of negative and repetitive thoughts, which are like a constant hammering. It is a question of learning to control what we think, thinking positively and in a focused manner, meditating and exercising the mind. We exercise to keep the body healthy and strong; in order to have a healthy and strong mind we have to learn exercises like meditation and relaxation that help us to free ourselves from repetitive thoughts which are nothing but bad positions or postures of the mind.