I've felt that ...

I've felt that dissatisfaction is the basis of progress. When we become satisfied in business, we become obsolete.
 J. Willard Marriott

Quotes from the same author

Good timber does not grow with ease; the stronger the wind, the stronger the trees.
 J. Willard Marriott
Motivate them, train them, care about them, and make winners out of them... they'll treat the customers right. And if customers are treated right, they'll come back.
 J. Willard Marriott
Entrepreneurs are never satisfied. They want to do things better. They strive for perfection and use all the ingenuity to their command to achieve it.
 J. Willard Marriott
Do it and do it now. Err on the side of taking action
 J. Willard Marriott
. . . success is a combination of many things, but a good character is the foundation of the kind of success that will bring you real happiness. Choose your friends wisely-they will make or break you.
 J. Willard Marriott