Risk can be greatly reduced by concentrating on only a few holdings.
I've got a terrible memory; it's probably because I'm always concentrating on what I'm doing now.
Beware of any work for God that causes or allows you to avoid concentrating on Him...
I am concentrating on my fitness levels so that I don't look old.
I am concentrating docilely on the question why U.S. restrooms always appear to us as infirmaries for public distress, the place to reagain control.
The important thing is to concentrate upon what you can do - by yourself, upon your own initiative.