Many people have self-help books as a part of their lives. You need to find a book that motivates you. However, not all books will be the same in their ability to motivate you. Habituation is a biological term that describes a phenomenon called habituation.
Habituation is the mechanism that causes a snail to stop retracting its antennae when it's prodded. Habituation is simply "getting used" to something that doesn't hurt you. It doesn't have to be life-threatening if it is irritating. It is what allows us to adjust to dark or obnoxious odors or loud sounds.
Self-help books and other motivational tools are the same. Although they can seem quite powerful upon first viewing or reading, the effect gradually diminishes over time until it disappears completely. This is unless the one you love keeps working for you, then you are lucky.
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This is great news for personal development. This means there is a huge market for these types of products. This also means that books from the past can be relevant and still in style for a long time. Napoleon Hill's classic "Think and Grow Rich" is an example. It is still available in its original form, but has been rewritten and looks as fresh as ever.
Motivational books for self-help will always include a section on goals and goal setting, which is a subject in its own right. This is because you must know where you are to get there. You might consider buying a book on self-motivation to help you get started.