“Se você construiu castelos no ar, não pense que desperdiçou seu trabalho; eles estão onde deveriam estar. Agora construa os alicerces.”
If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them.
Walden, Volume 1 - Página xli http://books.google.com.br/books?id=-EoLAAAAIAAJ&pg=PR41, Henry David Thoreau - Houghton, Mifflin, 1854
Walden
Citações relacionadas

“Agora a psicologia se assentará sobre um novo alicerce.”
Psychology will be based on a new foundation
On the origin of species by means of natural selection, or The preservation of favoured races in the struggle for life - página 424 http://books.google.com.br/books?id=ez9KAAAAYAAJ&pg=PA424, Charles Darwin - D. Appleton and company, 1869 - 432 páginas
“O neurótico constrói um castelo no ar. O psicótico mora nele. O psiquiatra cobra o aluguel.”
A neurotic is the man who builds a castle in the air. A psychotic is the man who lives in it. A psychiatrist is the man who collects the rent
citado em "Peter's Quotations: Ideas for Our Time" - Página 413, de Laurence J. Peter - Publicado por Morrow, 1977, ISBN 0688032176, 9780688032173 - 540 páginas

I suppose I have a really loose interpretation of “work,” because I think that just being alive is so much work at something you don't always want to do.
Andy Warhol, 1928-1987: works from the collections of José Mugrabi and an Isle of Man company - página 82, Andy Warhol, Jacob Baal-Teshuva, David Bourdon - Prestel, 1993, ISBN 3791312774, 9783791312774 - 144 páginas