Houdini was a master magician as well as a fabulous locksmith. He boasted that he could escape from any jail cell in the world in less than an hour, provided he could go into the cell dressed in his street clothes. A small town in the British Isles built a new jail they were extremely proud of. They issued Houdini a challenge.
"Come give us a try," they said. By the time he arrived, excitement was at a fever pitch. Houdini rode triumphantly into the town and walked into the cell. He proudly walked into the cell and the door was closed. Houdini took off his coat and went to work. Secreted in his belt was a flexible tough and durable ten-inch piece of steel, which he used to work on the lock.
At the end of 30 minutes his confident expression had disappeared. At the end of an hour he was drenched in perspiration. After two hours, Houdini literally collapsed against the door--which opened. Yes, it had never been locked--except in his mind. One little push and Houdini could have easily opened the door. Many times a little extra push is all you need to open your opportunity door. Most locked doors are in your mind.
Zig Ziglar, See You At the Top