A teacher should have knowledge of the content they are expected to teach in the class-room. A better preparation and execution of knowledge depends upon the skill of a teacher. These skills may be planning the lecture before each class. Better knowledge of the content may add to a productive learning environment in a class-room situation. It increases student's motivation. Updation of knowledge requires constant learning. As an agent of change he has himself to be flexible and ready to change. Updation of knowledge is an essential part of the job of a teacher. In recent years, there is a decline in motivation of reading and learning in the teachers. A good teacher should have expertise in not only the subject he is associated to. He must have knowledge beyond his domain; this is a part of knowledge updation. For a good teacher teaching is not only a vocation but a mission. Teachers have responsibility beyond their subject specialization.