Throughout the Bible, we can see that God often chooses to use unlikely heros.  For example, the apostle Paul was one of the greatest preachers and he says in the Bible that he didn’t have excellent speech.  His greatness was in the message that he preached…  He preached Christ.
 
1 Corinthians 2:1-5
And I, brethren, when I came to you, did not come with excellence of speech or of wisdom declaring to you the testimony of God.  For I determined not to know anything among you except Jesus Christ and Him crucified.  I was with you in weakness, in fear, and in much trembling.  And my speech and my preaching were not with persuasive words of human wisdom, but in demonstration of the Spirit and of power, that your faith should not be in the wisdom of men but in the power of God.