Quality is not an act, it is a habit.
If you think you can do it, you can.
It's always too early to quit.
If you can dream it, you can do it.
If you're going through hell, keep going.
After a storm comes a calm.
Either you run the day or the day runs you.
I can, therefore I am.
Be gentle to all and stern with yourself.
Know or listen to those who know.
We found out the Gemini spacesuit was, well, oxygen was flowing to keep me cool as well as to breathe, and it wasn't good enough. My visor got fogged.