Here is the Way of Heaven: When you have done your work, retire!
Lao Tzu (老子), Tao Te Ching (道德經), n.9. Translation by John Wu (1962).
Read this verse a few days ago. Very beautiful.
This verse came to my mind on Friday, after I had finished my essay writing marathon, which spanned over 2 days (with only 3 hours of sleep).