Summarize:

People generally consider the "rational mind" to be a good thing. We think of it as a function or process that guides our actions, logically, usually by avoiding emotion or biased judgment. Mind helps us to maximize good or benefit. For this reason, many philosophers tout mind as better than our more intuitive reactions. What is the mind? This is a big philosophical question. Let's be clear that we're not just talking about your brain. The mind is more than just your brain. In part, it's the seat of consciousness, the "I" that makes you who you are. The mind is also responsible for higher thought. It combines sense, thinking, judgment, and memory. It allows you to weigh cost and benefit to make reasoned decisions. Rational thinking is the ability to take many variables into account and to access, organize, and analyze information to reach a sound conclusion. Whether it is planning a budget, weighing the pros and cons of a new job, or arguing politics with friends, you use rational thinking every day. Rational thinking is very human. In fact, it's what separates us from other animals and is how we are able to use tools, build cities, develop technology, and spread as a species. So, it is a very valuable, useful trait. As you can see, rational thinking is a big reason why we are here today. This does not mean that more is necessarily better, however. Star Trek fans know that super-rational beings like Mr. Spock or Data are not really human because humans also need emotion. We are not like machines. To a certain point, rational thinking is beneficial. We can distance ourselves from strong emotions that might otherwise direct our decision-making. If emotion guided us, would people leave home to go to college, for example? Many would not the emotional strain and distance from loved ones would be too powerful, even if they knew, in their mind, that college was good for them. Rational thinking can sometimes go overboard, however. We would probably be paralyzed if we based our decisions only on reason. All choices, big and small, involve so many variables that it would be impossible to decide without listening to the heart. What should you eat for breakfast, for example? Should it be the healthiest food? The best-priced food? The most time-saving? Without a bit of heart, you would never be able to decide.
Start with the mind. Recognize rational patterns of thought. Learn the advantages and disadvantages of the mind.