subjugate your sphincter

"Civilization rests on two things," said Hitzig; "the discovery that fermentation produces alcohol, and voluntary ability to inhibit defecation. And I put it to you, where would this splendidly civilized occasion be without both?"
"Fermentation is undoubtedly science," said Gyllenborg; "but voluntary inhibition must be psychology, and if anybody suggests that psychology is a science I shall scream."
"No, no; you are on my ground now," said Stromwell; "inhibition of defecation is in essence a theological matter, and unquestionably one of the effects of the Fall of Man. And that, as everybody now recognizes, means the dawn of personal consciousness, the separation of the individual from the tribe, or mass. Animals have no such power of inhibition, as every stage manager who has to get a horse on and off stage without a mishap will assure you. Animals know themselves but dimly - even more dimly than we, the masters of the world. When Man ate the fruit from the Tree of Knowledge he became aware of himself as something other than a portion of his surroundings, and he dropped his last, carefree turd, as he, with wandering steps and slow, from Eden took his solitary way. After that he had, literally, to mind his step, not to speak of his Ps and Qs."

- Robertson Davies, The Rebel Angels (1981)