Either you run the day or the day runs you.
If you're going through hell, keep going.
Know or listen to those who know.
If you've got a talent, protect it.
Never complain and never explain.
If you can dream it, you can do it.
What you do today can improve all your tomorrows.
The secret of getting ahead is getting started.
Begin to be now what you will be hereafter.
Without hard work, nothing grows but weeds.
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.