A strong young athlete was wading waist deep in the shallow part of a recreational lake. Unknowingly he stepped off an underwater ledge and plunged 15 feet beneath the surface of the water. After several seconds, he bobbed to the top of the water flailing his arms and gasping for breath. The lifeguard attentively watched the situation from a nearby bank. A friend of the struggling young athlete grabbed the lifeguard by the arm and cried out, "Bob can't swim, you've got to help him." The young man's friend furiously yelled at the lifeguard, "If you won't go after him, I will." Calmly but firm the lifeguard said, "No one can help him yet. I'll help him when he's ready for my help." After a coupe more minutes the young athlete stopped his struggles, as his body became limp. The patient lifeguard suddenly dove into the water, swam out to the young man and brought him to shore for a successful rescue. Later the friend asked the lifeguard, "Why did you wait so long to help my friend?" The lifeguard responded, "As long as Bob was trying to save himself there was nothing I could have done for him. If I had swam out to him, he would have grabbed me and pulled me under with him. Only when he was weak, exhausted and had given up was I able to save him."