John 2:24, "But Jesus did not commit himself unto them, because he knew all [men]."
This was the first time Jesus had ministered in Jerusalem. Multitudes believed on Him when they saw the miracles He performed (v. 23). This looked like a perfect opportunity for Jesus to take these people and use them to spread the news far and wide that He was the Christ. Instead Jesus did just the opposite. He didn't want people proclaiming His gospel in their own ability.
This reveals an attitude of Jesus which is lacking among many Christians today. Jesus is more concerned with the quality of ministry than the quantity of ministry. In contrast, today's Christians often feel that "the end justifies the means."
We take new converts and place them in leadership--which is directly opposed to the Bible's instructions (1 Tim. 3:6). Many times movie stars or other famous people who have come to the Lord are made spokesmen for the Christian faith. This works to the harm of these people and the Body of Christ as a whole.
Some of you can't understand why the Lord hasn't used you, but rest assured the Lord is using everyone who is usable. Instead of looking at the need and begging God to use you, take a hard look at yourself and ask the Lord to make you usable.