How the Waorani tribe in Ecuador came to know Jesus

Five American missionaries in Ecuador Nate Saint, Jim Elliot, Roger Youderian, Ed McCully, and Peter Fleming, were speared by a people group that they had given their lives to serve.
Theses men had a burning desire to follow Jesus' command to take the gospel message into all the world. They had prayed for years for this primitive group that had never heard the redemption story of peace with God through the death of Christ. The Waoranis were one of the most violent tribes around, and killing was a way of life and survival.

The following is an extract from an article written by Nate Saint's son, Steve, extracted from Christianity Today:
http://www.christianitytoday.com/ct/6ta/6ta020.html

"My father and his four friends were not given the privilege of watching their children and grandchildren grow up. I've often wished I could have known my dad as an adult, for Mom and Aunt Rachel have often said our thought process and mannerisms are much alike. I have trouble distinguishing what I actually "remember" of him and what I have been told. But I do know that he left me a legacy, and the challenge now is for me to pass it on to my children. Dad strove to find out what life really is. He found identity, purpose, and fulfillment in being obedient to God's call. He tried it, tested it, and committed himself to it. I know that the risk he took, which resulted in his death and consequently his separation from his family, he took not to satisfy his own need for adventure or fame, but in obedience to what he believed was God's directive to him. I suppose he is best known because he died for his faith, but the legacy he left his children was his willingness first to live for his faith.

God took five common young men of uncommon commitment and used them for his own glory. They never had the privilege they so enthusiastically pursued to tell the Huaorani of the God they loved and served. But for every Waorani who today follows God's trail through the efforts of others, there are a thousand cowodi (outsiders, foreigners to the tribe) who follow God's trail more resolutely because of their example. This success, withheld from them in life, God multiplied and continues to multiply as a memorial to their obedience and his faithfulness."

How much are we willing to give to share the gospel with others?