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I just try to concentrate on concentrating.

The lesson I learned is that sometimes the task you have at hand needs all of your concentration and focus.

What do I mean by concentration? I mean focusing totally on the business at hand and commanding your body to do exactly what you want it to do.

The more you focus, the more that focus becomes a habit.

Discipline and concentration are a matter of being interested.

The important thing is to concentrate upon what you can do - by yourself, upon your own initiative.

I just have to concentrate on doing what I do.

I keep one simple rule that I only move in one direction - I write the book straight through from beginning to end. By following time's arrow, I keep myself sane.

You focus on the things that you can control, and that's what I'm doing.