Share 'Looking for a source for this Nadar quote'

Dear All, On my computer I have a quote, supposedly from Nadar, that I copied from somewhere nearly 20 years ago. I want to use it in something I'm writing but I can't find a source for it. Googling it only brings up a handful of matches, all of which originate from me. I've also tried translating bits of it back into French and googling those but again can't find any matches. The quote is: ‘thi…