Dalton Trumbo said this quote
“ What the hell does liberty mean anyhow? It's just a word like house or table or any other word. Only it's a special kind of word. A guy says house and he can point to a house to prove it. But a guy says come on let's fight for liberty and he can't show you liberty. He can't prove the thing he is talking about so how in the hell can he be telling you to fight for it? ”