BALANCE:
Balance is perhaps the most important principle in any sport. The basic strategy of Judo, for instance, is to keep your opponent off balance while maintaining your own. By keeping your own balance, you will have use of your maximum power while your opponent uses part of his energy trying to regain his balance. The more off balance he is, the more strength he will need to recover.
Jay, Wally. small-circle jujitsu. United States: Ohara Publication, Inc, 2007.