Walls don't work. … Instead of building walls to create security, we need to build bridges.

Source: "A Navy Admiral's Thoughts on Global Security." TEDGlobal2012. Jun. 2012. Conference Presentation. Additional Information: This quote is from Navy Admiral James Stavridis's 2012 TED Talk about security in the 21st Century. The quote describes Stavridis's theory of "open source security" -- that global conflicts are best solved/prevented by increasing communication and exchange, rather than by trying to shut out our rivals, as we did figuratively and literally during the Cold War with "wall"-type solutions like the Berlin Wall. Watch the full TED Talk here: James Stavridis - A Navy Admiral's Thoughts on Global Security