Go for it now. The future is promised to no one.
The wise does at once what the fool does at last.
If you're going through hell, keep going.
Know or listen to those who know.
Be thine own palace, or the world's thy jail.
Wherever you are - be all there.
Never complain and never explain.
If you can dream it, you can do it.
Who seeks shall find.
Quality is not an act, it is a habit.
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.