Making an honest mistake is acceptable. Failing to fix it is not.
Greatness is not how you feel, it's how you make others feel.
Always do what you can do instead of worrying about what you can't.
You can't stop change. Don't let it stop you.
What you did in the past is how you got to today. What you do today is how you will get to the future.
A great leader makes what is visible in their mind, visible to all.