Without hard work, nothing grows but weeds.
Expect problems and eat them for breakfast.
If you think you can do it, you can.
Go for it now. The future is promised to no one.
Begin to be now what you will be hereafter.
Wherever you are - be all there.
Things do not happen. Things are made to happen.
Leap, and the net will appear.
You never know what motivates you.
The wise does at once what the fool does at last.
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.