Jean Antoine Petit-Senn was a poet of French-Swiss origin. Among many quotes attributed to him is this one...
"Not what we have, but what we enjoy, constitutes our abundance."
...which appeared in the American comic strip Mutts on November 19, 2007.
According to the 11th edition of the Encyclopædia Britannica:
Jean Antoine Petit-Senn was a thorough Genevese and a biting satirist, a pensive poet, the Genevese La Bruyère, as he liked to be called, but was not fully appreciated till after his death, when his widely scattered writings were brought together.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed.. Encyclopædia Britannica. Cambridge University Press.