Successful evangelists have reasons to boast, because they persuade people to choose Christ. Method and delivery are exalted above content. Offensive doctrines like eternal judgment and total depravity are avoided, so as not to drive away seekers. This is not to say that man has no role in God s mission. Man is used as an instrument in the hands of God.
Success is questionable, since it missions is seen as man s mission, and humans make mistakes.
With a man-centered viewpoint, when we succeed, we tend to become prideful, and when we fail, we tend to get defeated. Though to the world it appears as if you have made a great sacrifice, when we focus on the sacrifice that Christ paid for us and the benefits that He gave to us, our sacrifice is minimal. With the wrong perspective, the sacrifice becomes unbearable, and when too much rejection, too much hardship comes, the man-centered missionary is more likely to give up.