Always desire to learn something useful.
You never know what motivates you.
What you do today can improve all your tomorrows.
Only the educated are free.
Either you run the day or the day runs you.
Well done is better than well said.
The wise does at once what the fool does at last.
Problems are not stop signs, they are guidelines.
Without hard work, nothing grows but weeds.
The dog that trots about finds a bone.
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.