When you have an interest in something then you want to look at it or learn more about it. Interest quotes show that there are many types of interest. If you notice a pretty girl or a handsome guy then you may show an interest in them, flirting and making small talk in order to get their attention. If you have an interest in science then you may spend all of your free time performing experiments and learning more about this subject. Sometimes interest can grow into obsession, especially if your plans do not turn out as expected and you can not stop thinking about the object of your interest. Another meaning for the word interest references the amount of extra money that is paid back on a loan. When you have a mortgage on your home part of your monthly payment goes towards interest and the rest is applied to the principal.