I can, therefore I am.

What you do today can improve all your tomorrows.

Begin to be now what you will be hereafter.

Be thine own palace, or the world's thy jail.

If you're going through hell, keep going.

To be a good loser is to learn how to win.

Well done is better than well said.

It's always too early to quit.

Problems are not stop signs, they are guidelines.