This text attempts to lay emphasis on the whys of mathematics rather than on the hows. The material covered is the same as is generally found in a first course in calculus, namely, the study of functions of a real variable, but the approach is different. A conscious effort is made to give strong motivation for the abstract concepts covered and thereby help a beginner overcome most of the aversion one has for abstraction. For example, instead of merely giving the epsilon-delta definition of a limit, a whole section is devoted to explain how the definition evolved and why it is a most natural formulation of the basic concept of a limit. This should help the student get over the clumsiness of the definition, which can be quite repulsive otherwise.