The man who has done his level best... is a success, even though the world may write him down a failure.
B. C. Forbes
The measure of success is not whether you have a tough problem to deal with, but whether it is the same problem you had last year.
John Foster Dulles
The most important single ingredient in the formula of success is knowing how to get along with people.
The one phrase you can use is that success has a thousand fathers, and failure is an orphan.
Those who have succeeded at anything and don't mention luck are kidding themselves.