If you think you can do it, you can.
The secret of getting ahead is getting started.
The wise does at once what the fool does at last.
Problems are not stop signs, they are guidelines.
What you do today can improve all your tomorrows.
Never complain and never explain.
If you're going through hell, keep going.
Wherever you are - be all there.
Only the educated are free.
Well done is better than well said.
In wilderness I sense the miracle of life, and behind it our scientific accomplishments fade to trivia.
I have seen the science I worshiped, and the aircraft I loved, destroying the civilization I expected them to serve.