Some men get in the habit of thinking "I can't" and they fail.
Others think "I can" and succeed. So remember, it is for you to
decide whether you will join the army of "I can't" or "I can."

The big mistake with so many is that they don't realize that when
they say "I can't," they really say, "I won't try." You can not
tell what you can do until you try. "Can't" means you will not
try. Never say you cannot concentrate, for, when you do, you are
really saying that you refuse to try.

Whenever you feel like saying, "I can't," say instead, "I possess
all will and I can use as much as I wish." You only use as much
as you have trained yourself to use.

An Experiment to Try. Before going to bed tonight, repeat, "I am
going to choose my own thoughts, and to hold them as long as I
choose. I am going to shut out all thoughts that weaken or
interfere; that make me timid. My Will is as strong as anyone's
else. While going to work the next morning, repeat this over.
Keep this up for a month and you will find you will have a better
opinion of yourself. These are the factors that make you a
success. Hold fast to them always.

Concentration is nothing but willing to do a certain thing. All
foreign thoughts can be kept out by willing that they stay out.
You cannot realize your possibilities until you commence to
direct your mind. You then do consciously what you have before
done unconsciously. In this way you note mistakes, overcome bad
habits and perfect your conduct.