By failing to prepare, you are preparing to fail.
Only the educated are free.
If you think you can do it, you can.
Be kind whenever possible. It is always possible.
Expect problems and eat them for breakfast.
What you do today can improve all your tomorrows.
The wise does at once what the fool does at last.
It's always too early to quit.
You never know what motivates you.
Either you run the day or the day runs you.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.