It's always too early to quit.
Without hard work, nothing grows but weeds.
Leap, and the net will appear.
If you can dream it, you can do it.
To be a good loser is to learn how to win.
What you do today can improve all your tomorrows.
Always desire to learn something useful.
Well done is better than well said.
Begin to be now what you will be hereafter.
To know oneself, one should assert oneself.
In science there is only physics all the rest is stamp collecting.