My yoga teacher told us another real story... An elephant was brought up by a circle, and he was tied at a big tree since young. After 6 years, he has grown up to be a big elephant, but still tied under the tree. One day, the circle caught in fire, and the elephant was burn and died. He could actually run away as he is big enough to escape from the big tree.
The story is to tell us that we could not think like the elephant. All of us are brought up in a certain way, and we are subconsciously think that what we do and think are right. We are too comfortable with our life, and never prepare to change it anyway.
Never under estimate yourself, you wont know you can do beyond your capability until you try it!