"No one is immune to failure. All have tasted the bitterness of defeat and disappointment. A warrior must not dwell on that failure, but must learn from it and continue on. But not all learn from their errors. That is something those who seek to dominate others know very well, and know how to exploit it. If an opponent has failed once at a lococal problem, his enemy will first try the same type of problem, hoping the failure will be repeated.