Never complain and never explain.
If you think you can do it, you can.
Be gentle to all and stern with yourself.
Without hard work, nothing grows but weeds.
By failing to prepare, you are preparing to fail.
Quality is not an act, it is a habit.
The dog that trots about finds a bone.
Be thine own palace, or the world's thy jail.
The secret of getting ahead is getting started.
Only the educated are free.
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.