It's always too early to quit.
Well done is better than well said.
To be a good loser is to learn how to win.
The most effective way to do it, is to do it.
The dog that trots about finds a bone.
Always desire to learn something useful.
If you think you can do it, you can.
If you're going through hell, keep going.
You never know what motivates you.
Wherever you are - be all there.
I tried a dozen different modifications that were rejected. But they all served as a path to the final design.
I'm proud of my invention, but I'm sad that it is used by terrorists.