Well done is better than well said.
It's always too early to quit.
If you think you can do it, you can.
If you can dream it, you can do it.
Begin to be now what you will be hereafter.
What you do today can improve all your tomorrows.
Always desire to learn something useful.
Only the educated are free.
Know or listen to those who know.
Leap, and the net will appear.
I spent every night until four in the morning on my dissertation, until I came to the point when I could not write another word, not even the next letter. I went to bed. Eight o'clock the next morning I was up writing again.