Either you run the day or the day runs you.
Do not weep do not wax indignant. Understand.
Be thine own palace, or the world's thy jail.
Quality is not an act, it is a habit.
Always desire to learn something useful.
Be kind whenever possible. It is always possible.
It's always too early to quit.
To know oneself, one should assert oneself.
What you do today can improve all your tomorrows.
To be a good loser is to learn how to win.
In hard-core science fiction in which characters are responding to a change in environment, caused by nature or the universe or technology, what readers want to see is how people cope, and so the character are present to cope, or fail to cope.