Jean-Jacques Rousseau Quote
What I had to say was so clear and I felt it so deeply that I am amazed by the tediousness, repetitiousness, verbiage, and disorder of this writing. What would have mad it lively and vehement coming from another's pen is precisely hat has made it dull and slack coming from mine. The subject was myself, and I no longer found on my own interest that zeal and vigor of courage which can exalt a generous soul only for another person's cause.
On the Subject and Form of This Writing - Dialogues: Rousseau Judge of Jean-Jacques (published 1782)