Animals feel pleasure in performing all the functions for which they are destined... There is great pleasure in eating and drinking... but it is clear that if man were always eating... his organs could not sustain it.
Source, in full
Dictionnaire philosophique, (1764). / ("Les animaux ressentent du plaisir à faire toutes les fonctions auxquelles ils sont destinés... Il y a un grand plaisir à manger et à boire... mais il est clair que si l'homme mangeait toujours... ses organes n'y pourraient suffire.")