Please help! Does anyone know where this V. Woolf quote is from?

[MariannaOust]

"The eyes of others our prisons, their thoughts our cages." I've looked through so many websites, but none actually say where she said it. Is it in a book or essay? Does anyone have any idea?

[Silas Thorne]

I know very little about Virginia Woolf, but this website: http://www.sallypayen.info/pages/About.html

says that this quote is from an unwritten novel (1921).