It's always too early to quit.
If you can dream it, you can do it.
Things do not happen. Things are made to happen.
Without hard work, nothing grows but weeds.
By failing to prepare, you are preparing to fail.
To be a good loser is to learn how to win.
Well done is better than well said.
The most effective way to do it, is to do it.
To know oneself, one should assert oneself.
If you're going through hell, keep going.
All science is either physics or stamp collecting.