The cheerful mind perseveres and the strong mind hews its way through a thousand difficulties.

There is no limit to the power of the human mind. The more concentrated it is, the more power is brought to bearon one point.

The infinite library of the Universe is in your mind.

Be devoted to conscientiousness. Guard your own mind.

Most folks are as happy as they make up their minds to be.

Happiness depends more upon the internal frame of a person's own mind than on the externals in the world.