(Prior art from 2000+ years ago.)
The first 29 letters (out of 124) that Seneca wrote, to his friend Lucilius, end with a quotation—the "daily dole" referenced below—from writings that have impressed Seneca. He ends his letter 6 this way:
<quote>
Meanwhile, as I owe you the daily dole, I will tell you what pleased me today in the writings of Hecaton:
"Do you ask what progress I have made? I have begun to be a friend to myself."
Valuable progress indeed: he will never be alone. Believe me, such a person will be a friend to everyone.
Farewell.
</quote>