The African Impala (an African antelope) are amazing creatures that can jump to a height of over 10 feet and cover a distance greater than 30 feet. Yet Impalas can be kept in a zoo inside an enclosure with a simple 3 foot wall. Why? Impalas will not jump if they can't see where their feet will land. Do we have something in common with these antelopes? Able to take great leaps of faith, but refusing to do it unless we can see where we'll land?