It takes approximately seven years to get a Ph.D. in economics from a leading school. But it’s borderline fair to say you can capture those seven years in one sentence:
If the other guy’s getting better, then you’d better be getting better faster than the other guy’s getting better…or you’re getting worse!
As told by Tom Peters in The Circle of Innovation

“The best way to predict the future is to create it.”
-Abraham Lincoln

“Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do.”
-Steve Jobs

“Don’t wait for opportunities, create them.”
-Charles R. Schwab

“The biggest risk is not taking any risk. In a world that’s changing quickly, the only strategy that is guaranteed to fail is not taking risks.”
-Mark Zuckerberg

“You can’t build a reputation on what you are going to do.”
-Henry Ford

“Successful people do what unsuccessful people are not willing to do. Don’t wish it were easier, wish you were better.”
-Jim Rohn

“You don’t have to be great to start, but you have to start to be great.”
-Zig Ziglar

“Success is walking from failure to failure with no loss of enthusiasm.”
-Winston Churchill

“Don’t be afraid to give up the good to go for the great.”
-John D. Rockefeller

“You don’t learn to walk by following the rules. You learn by doing and falling over.”
-Richard Branson