I realize that there are circumstances and situations in our lives that we have little control over that may limit how high we can hike in this life, but more often than not, our limitations are ones that we place on ourselves. Those choices become weights that we have strapped to our own feet. We all have limiting circumstances that grow out of poor choices or a wrong attitude, but we have the ability to unstrap those weights and to rise above these limitations.
Think about his analogy. In the early days of the steam-powered train, respected scientists urged the engineers to limit the speed to thirty miles per hour because they believed that the human body exploded at speeds faster than that. Finally some brave people risked going beyond that limiting belief and found that they did not explode. The crew of NASA's Apollo 10 moon mission reached a top speed of 24,791 mph relative to Earth as they rocketed back to our planet on May 26, 1969. Someday we will reach speeds much greater.