David Wilkerson impacted the life of Nicky Cruz and the gangs of New York, but he did much more, all because he was obedient to God’s whisper. If you want to change the world for the better, you might want to read this story about David Wilkerson’s journey of faith:
http://www.christianitytoday.com/ct/2011/aprilweb-only/rememberingdavidwilkerson.html