"People of mediocre ability sometimes achieve outstanding success because they don't know when to quit. Most men succeed because they are determined to."
George Herbert Allen

Flaming enthusiasm, backed by horse sense and persistence, is the quality that most frequently makes for success.
Dale Carnegie

They can because they think they can.
Virgil

Nothing can stop the man with the right mental attitude from achieving his goal; nothing on earth can help the man with the wrong mental attitude.
W.W. Ziege

The thing always happens that you really believe in; and the belief in a thing makes it happen.
Frank Loyd Wright

A failure is a man who has blundered, but is not able to cash in on the experience.
Elbert Hubbard

There is only one success--to be able to spend your life in your own way.
Christopher Morley

I cannot give you the formula for success, but I can give you the formula for failure--which is:
Try to please everybody.
Herbert Bayard Swope

Success is the good fortune that comes from aspiration, desperation, perspiration and inspiration.
Evan Esar