The wise does at once what the fool does at last.
Only the educated are free.
Either you run the day or the day runs you.
The dog that trots about finds a bone.
Who seeks shall find.
Be gentle to all and stern with yourself.
Without hard work, nothing grows but weeds.
Leap, and the net will appear.
You never know what motivates you.
Always desire to learn something useful.
Science fiction is an amazing literature: plot elements that you would think would be completely worn out by now keep changing into surprising new forms.