Expect problems and eat them for breakfast.
Do not weep do not wax indignant. Understand.
If you think you can do it, you can.
To know oneself, one should assert oneself.
You never know what motivates you.
The dog that trots about finds a bone.
Begin to be now what you will be hereafter.
Without hard work, nothing grows but weeds.
Go for it now. The future is promised to no one.
Either you run the day or the day runs you.
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.