Your are right Saptagiri, it's a CALLING. Not everyone is cut out for teaching. If people think it has fixed hours with a long vacation, they are partly right. A teacher has to keep updating with both knowledge and technology. For example, when I started I used to write with a chalk on a blackboard and use some hand written slides using Overhead Projectors. Could give some ammonia prints as hand outs; then came the photocopiers, computers, ppt slides, printers; and now we have SMART Boards and other facilities. I used to keep in touch with my students by email; now some even demand to link up with me on Yahoo Messenger or Skype for instant chatting, etc.
In the 70s as a management student, I had not heard of Michael Porter; but in the 80s as a Master's student I encountered his works. Similarly, while attending international conferences I came across works of Noriaki Kano, and met Bill McKeachie and came across his work "McKeachie's Teaching Tips". We have to be life-long learners ourselves if we have to teach students to become one, in this fast changing world.
Have a nice day.
Simhan