Do not weep do not wax indignant. Understand.
Be gentle to all and stern with yourself.
By failing to prepare, you are preparing to fail.
Quality is not an act, it is a habit.
Well done is better than well said.
Begin to be now what you will be hereafter.
I can, therefore I am.
Always desire to learn something useful.
Either you run the day or the day runs you.
Know or listen to those who know.
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.