Many thanks for your kind care for my health; I certainly have not been well for many weeks, and about a week ago I was very poorly. I have had a good deal of fever at times, and indifferent nights; but I am considerably better now and am recovering my looks a little, which have been bad enough — black and white, and every wrong colour. I must not depend upon being ever very blooming again. Sickness is a dangerous indulgence at my time of life.

Letter to Fanny Knight (1817-03-23)