Do that for which nature has suited you ...

Learn to limit yourself, to content yourself with some definite thing, and some definite work; dare to be what you are, and learn to resign with a good grace all that you are not, and to believe in your own individuality.

The shoemaker makes a good shoe because he makes nothing else.

The same man cannot well be skilled In everything; each has his special excellence.

Specialization is for insects!

A man may have intelligence enough to excel in a particular thing and lecture on it, and yet not have sense enough to know he ought to be silent on some other subject of which he has but a slight knowledge; if such an illustrious man ventures beyond the bounds of his capacity, he loses his way and talks like a fool.

You specialize in something until one day it is specializing in you.

The trouble with specialists is that they tend to think in grooves.

If you want to succeed, limit yourself.