Optimist, Helen Keller

No pessimest ever discovered the secret of the stars, or sailed to an unchartered land or opened a new heaven to the human spirit.

- Helen Adams Keller (1880–1968)

http://en.wikiquote.org/wiki/Helen_Keller

Failure, Irish Proverb

The girl who can't dance says the band can't play.

- Irish Proverb

Failure, Confucius (孔子)

不而不改 是謂過矣。

- 孔子

A man who has committed a mistake and doesn't correct it, is committing another mistake.

- Confucius (孔子, 551BC–479BC)

Failure, English Proverb

A small leak will sink a great ship.

- English Proverb

Failure, Elbert Hubbard

The greatest mistake you can make in life is to be continually fearing you will make one.

- Elbert Hubbard (1856-1915)

Failure, Confucius

Be not ashamed of mistakes and thus make them crimes.

- Confucius (孔子, 551BC–479BC)

Failure, Confucius

知之者不如好之者。

- 孔子

He who merely knows right principles is not equal to him who loves them.

- Confucius (551BC–479BC) (孔子)