Everyone sits in the prison of his own ideas; he must burst it open, and that in his youth, and so try to test his ideas on reality.

— Albert Einstein, Cosmic Religion (1931)

Source: http://books.google.com/books?id=cvlOAAAAMAAJ&q=%22Everyone+sits+in+the+prison+of+his+own+ideas+he+must+burst+it+open+and+that+in+his+youth+and+so+try+to+test+his+ideas+on+reality%22&pg=PA104#v=onepage

From the 'Miscellaneous' section of Cosmic Religion (1931).

Topics: learning