Man from a psychological standpoint of development is not what he
should be. He does not possess the self-mastery, the
self-directing power of concentration that is his by right.

He has not trained himself in a way to promote his self-mastery.
Every balanced mind possesses the faculties whose chief duties
are to engineer, direct and concentrate the operations of the
mind, both in a mental and physical sense. Man must learn to
control not only his mind but his bodily movements.

When the controlling faculties (autonomic) are in an untrained
condition, the impulses, passions, emotions, thoughts, actions
and habits of the person suffer from lack of regulation, and the
procedure of mental concentration is not good, not because the
mind is necessarily weak in the autonomic department of the
faculties, but because the mind is not properly trained.

When the self-regulating faculties are not developed the
impulses, appetites, emotions and passions have full swing to do
as they please and the mind becomes impulsive, restless,
emotional and irregular in its action. This is what makes mental
concentration poor.

When the self-guiding faculties are weak in development, the
person always lacks the power of mental concentration. Therefore
you cannot learn to concentrate until you develop those very
powers that qualify you to be able to concentrate. So if you
cannot concentrate one of the following is the cause:

1. "Deficiency of the motor centers."