The Master Key excerpt by Charles Haanel

There is a principle of mathematics, but none of error;

there is a principle of health, but none of disease;

there is a principle of truth, but none of dishonesty;

there is a principle of light, but none of darkness,

and there is a principle of abundance, but none of poverty.

How shall we know that this is true?
Because if we apply the principle of mathematics correctly we shall be certain of our results. Where there is health there will be no disease. If we know the truth
we cannot be deceived by error. If we let in light there can be no darkness,
and where there is abundance there can be no poverty.

"When the power's out in the heart of man
take it from your heart
put it in your hand!"
Arcade Fire - Neighborhood #3 (Power Out)