Either you run the day or the day runs you.
What you do today can improve all your tomorrows.
To be a good loser is to learn how to win.
If you're going through hell, keep going.
Who seeks shall find.
Be gentle to all and stern with yourself.
It's always too early to quit.
Know or listen to those who know.
Quality is not an act, it is a habit.
Never complain and never explain.
Science fiction is an amazing literature: plot elements that you would think would be completely worn out by now keep changing into surprising new forms.