Know or listen to those who know.
Only the educated are free.
It's always too early to quit.
Who seeks shall find.
Quality is not an act, it is a habit.
Things do not happen. Things are made to happen.
Expect problems and eat them for breakfast.
To know oneself, one should assert oneself.
Always desire to learn something useful.
If you think you can do it, you can.
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.