Intellect is the capacity of the mind by which one reasons. It does not involve the power to feel and move but the power to think. Subjects like Logic, Philosophy and Mathematics all involve the intellect. The intellect involves the power to identify, associate and differentiate. To identify is to find out what a thing is exactly. To associate is to find similarities between things, how they are alike, how they are like each other. To differentiate is to find out how things are different from each other. The intellect is always involved in at least one of these three activities.