I really like this quote. It's simple yet powerful.
"There is one big limitation or obstacle. And that is our personal laziness. If we overcome that the possibilities are amazing."
This is taken from: Vladimir Vasiliev, Personal Interview with Mikhail Ryabko, (April 16th 2008).
For the full article go to: http://www.russianmartialart.com/main.php?page=article_info&articles_id=26&osCsid=3e25c11c8c925c5ad943069f1fdb0299