People who are always bringing up their services are a nuisance.
 Marcus Tullius Cicero, On Friendship (44 BC). copy citation

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Author Marcus Tullius Cicero
Source On Friendship
Topic nuisance service
Date 44 BC
Language English
Reference
Note Translated by E. S. Shuckburgh
Weblink http://www.gutenberg.org/files/2808/2808-h/2808-h.htm

Context

“But most people of that sort are forever either grumbling at something, or harping on their claims; and especially if they consider that they have services of their own to allege involving zeal and friendship and some trouble to themselves. People who are always bringing up their services are a nuisance. The recipient ought to remember them; the performer should never mention them. In the case of friends, then, as the superior are bound to descend, so are they bound in a certain sense to raise those below them.” source