“There is one type of person who, whenever he has done a
good deed to another, expects and calculates to have the favour repaid. There
is a second type of person who does not calculate in such a way but who,
nevertheless, deep within himself regards the other person as someone who owes
him something and he remembers that he has done the other a good deed.
But there is a third type of person who, in some sense, does
not even remember the good deed he has done but who, instead, is like a vine
producing its grape, seeking nothing more than having brought forth its own
fruit, just like a horse when it has run, a dog when it has followed its scent
and a bee when it has made honey. This man, having done one good deed well,
does not shout it about but simply turns his attention to the next good deed,
just like the vine turns once again to produce its grape in the right season.” -Marcus
Aurelius (Source)