An archaeologist once hired some Inca tribesmen to lead him to an archaeological site deep in the mountains. After they had been moving for some time the tribesmen stopped and insisted they would go no further. The archaeologist grew impatient and then angry. But no matter how much he cajoled the tribesmen would not go any further. The all of a sudden the tribesmen changed their attitude. They picked up the gear and set off once more. When the bewildered archaeologist asked why they had stopped and refused to move for so long, the tribesmen answered, “We had been moving too fast and had to wait for our souls to catch up.”
Source: based on a story told in the movie Beyond the Clouds