It's always too early to quit.
Either you run the day or the day runs you.
The dog that trots about finds a bone.
Be gentle to all and stern with yourself.
Do not weep do not wax indignant. Understand.
By failing to prepare, you are preparing to fail.
The most effective way to do it, is to do it.
Problems are not stop signs, they are guidelines.
If you've got a talent, protect it.
If you're going through hell, keep going.
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.