What the mind can conceive and believe, the mind can achieve.
The mind requires regular use to remain strong.
Men have no confidence in an officer who doesn't know his own mind.
Truly, thoughts are things, and their scope of operation is the world itself.
The great master key to riches is nothing more or less than the self-discipline necessary to help you take full and complete possession of your own mind.
Nothing is more tragic - or more common - than mental inertia.