Everybody's got a different circle of competence. The important thing is not how big the circle is. The important thing is staying inside the circle.
My basic strategy is to stick to my core business and to my area of expertise.
The same man cannot well be skilled in everything; each has his special excellence.
If I have any insight at all to contribute it is this: find out what you are really good at and stick to it.
One of the best uses of your time is to increase your competence in your key result areas.
We are all so to speak intellectuals about something.