I picked the first quote by Theodore Roosevelt.
"Believe you can and you're halfway there." Theodore Roosevelt
I think it means that if you have a goal, 50% is doing the work and 50% is believing in yourself. It can be used in our own lives with the following example. Say that you are faced with a problem. You're not sure if that is within your limits. But if you believe in yourself half of the problem is solved. Then you tackle the problem. This quote can be used to change the attitude of those who have little self esteem. Like a turbocharger on a car, it can boost their over all self esteem. This quote can impact the world by motivating the men and women of this planet to create and innovate to create a better, cleaner, safer tomorrow.