The dog that trots about finds a bone.
If you've got a talent, protect it.
Quality is not an act, it is a habit.
The wise does at once what the fool does at last.
Go for it now. The future is promised to no one.
Do not weep do not wax indignant. Understand.
Never complain and never explain.
Things do not happen. Things are made to happen.
If you think you can do it, you can.
Wherever you are - be all there.
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.