A traveler was making his way, feeling confident and safe, walking a while and then running a while, and then resting or sleeping. He came across a shady place, with abundant cool water and a blossoming garden, and decided to rest for a while.
While he was relaxing, he was attacked by an enemy who seized him and tied him up. He saw destruction looming and thought that his end had come, that he would become a feast for lions and never reach his destination.
While he was in this state, troubled by thoughts of despair, his merciful and caring father suddenly appeared before him. He untied him and told him to be on his way and to be wary of the enemy which lurked in ambush along the road. He assured him that as long as he remained alert and vigilant he would not be overcome, but that if he was negligent he would once again be captured. His father said that he would go ahead and lead him to his destination.
If the traveler stayed alert and kept his presence of mind and remained prepared for his enemy, then his journey would be better than it had been before, and he would arrive more quickly. If, on the other hand, he forgot about his enemy and returned to his former state of inattention and forgetfulness, indifferent to danger and only mindful of the pleasant garden, then he would once again become an easy target.