Do you have what it takes to succeed?

I think George E. Allen was on the right track when he said this:

“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 E. Allen
1832-1907, Publisher and Author

What are your dreams? What do you know you can achieve not necessarily because of your ability but because of your determination; because you keep going when others would give up?