A man who publishes his letters becomes a nudist - nothing shields him from the world's gaze except his bare skin. A writer, writing away, can always fix things up to make himself more presentable, but a man who has written a letter is stuck with it for all time.
The essayist . . . can pull on any sort of shirt, be any sort of person, according to his mood or his subject matter - philosopher, scold, jester, raconteur, confidant, pundit, devil's advocate, enthusiast.
I am often mad, but I would hate to be nothing but mad: and I think I would lose what little value I may have as a writer if I were to refuse, as a matter of principle, to accept the warming rays of the sun, and to report them, whenever, and if ever, they happen to strike me.