Victor Hugo,
Les Misérables — Volume 5, Book Second…
“ The last veil is torn away. A sewer is a cynic. It tells everything.The sincerity of foulness pleases us, and rests the soul. When one has passed one's time in enduring upon earth the spectacle of the great airs which reasons of state, the oath, political sagacity, human justice, professional probity, the austerities of situation, incorruptible robes all assume, it solaces one to enter a sewer and to behold the mire which befits it.This is instructive at the same time. We have just said that history passes through the sewer. ”
