An object in possession seldom retains the same charm that it had in pursuit. — Pliny the Younger. Roman lawyer, author and magistrate (61 – c. 113) Possessions
There is nothing to write about, you say. Well then, write and let me know just this - that there is nothing to write about; or tell me in the good old style if you are well. That's right. I am quite well.
However often you may have done them a favour, if you once refuse they forget everything except your refusal.