Things do not happen. Things are made to happen.
Expect problems and eat them for breakfast.
Either you run the day or the day runs you.
Only the educated are free.
If you're going through hell, keep going.
Begin to be now what you will be hereafter.
Without hard work, nothing grows but weeds.
Quality is not an act, it is a habit.
The wise does at once what the fool does at last.
Well done is better than well said.
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.