1.

Theodore Roosevelt

Believe you can and you're halfway there.

2.

Confucius

It does not matter how slowly you go as long as you do not stop.

3.

Winston Churchill

Success is not final, failure is not fatal: It is the courage to continue that counts.

4.

Sam Levenson

Don't watch the clock; do what it does. Keep going.

5.

Wayne Gretzky

You miss 100% of the shots you don't take.

6.

Thomas Edison

I have not failed. I've just found 10,000 ways that won't work.

7.

C.S. Lewis

You are never too old to set another goal or to dream a new dream.

8.

Steve Jobs

The only way to do great work is to love what you do.

9.

Theodore Roosevelt

Keep your eyes on the stars, and your feet on the ground.

10.

Zig Ziglar

You don't have to be great to start, but you have to start to be great

11.

LeBron James 

Hard work, dedication, and perseverance. That's the formula for success.