Interest

You may ask, "How about if I really have an interest in that particular subject?"

Good. Let me take you through a slightly circumventing argument:

Why should people choose a subject that they have interest ? Simple. They would enjoy the process, and there is a greater likelihood that they would be successful.

The former argument is nothing more or less than a blind. Most of our happiness does not come from the job per se, but from our family, friends, and hobbies. (If you happen to need a particular job purely for pleasure, you'd better see a psychiatrist.) Yes, we often have much satisfaction from the work, but that's almost always because of our achievement in it. For example, hardly any one would have pleasure from standing in the operating theatre for several hours (as I said, go see a psychiatrist); most surgeons would feel happy because, after all their hardship, the cancer patient is cured and walk out of the hospital.

As Hercule Poirot said (in Murder on the Links): If you do not see the difference between the two, you could not see anything.

PS. The reverse of this argument, however, is generally correct: Many of us would have a few subjects that we definitely feel sick with the process, and it goes without saying that we should avoid doing that job - however good the prospect is.

That's why I could never be an administrator.