What is your favorite/best wise quotations?

-A response to questions from Quora.com 2020

“The one quality which sets one man apart from another- the key which lifts one to every aspiration while others are caught up in the mire of mediocrity- is not talent, formal education, nor intellectual brightness - it is self-discipline. With self-discipline all things are possible. Without it, even the simplest goal can seem like the impossible dream.”—Theodore Roosevelt—