Things do not happen. Things are made to happen.
Do not weep do not wax indignant. Understand.
The secret of getting ahead is getting started.
Never complain and never explain.
To know oneself, one should assert oneself.
Be gentle to all and stern with yourself.
If you're going through hell, keep going.
Know or listen to those who know.
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.