This excerpt is taken from the SundaySchoolNetwork.com newsletter.  It is an interesting perspective on who God chose to be teachers of his word.The next time you feel like GOD can't use you, just remember... 
Noah was a drunk 
Abraham was too old 
Isaac was a daydreamer 
Jacob was a liar 
Leah was ugly 
Joseph was abused 
Moses had a stuttering problem 
Gideon was afraid 
Samson had long hair and was a womanizer 
Rahab was a prostitute 
Jeremiah and Timothy were too young 
David had an affair and was a murderer 
Elijah was suicidal 
Isaiah preached naked 
Jonah ran from God 
Naomi was a widow 
Job went bankrupt 
Peter denied Christ 
The Disciples fell asleep while praying 
Martha worried about everything 
The Samaritan woman was divorced, more than once 
Zacchaeus was too small  
Paul was too religious 
Timothy had an ulcer... 
AND 
Lazarus was dead! 
Now, no more excuses! God can use you to your full potential...Besides you aren't the message,you are just the messenger. And one more thing...Share this with a friend or two...In the Circle of God's love, God's waiting to use your full potential.