Exodus 4:10-12 (NIV) 10 Moses said to the LORD, "O Lord, I have never been eloquent, neither in the past nor since you have spoken to your servant. I am slow of speech and tongue." 11 The LORD said to him, "Who gave man his mouth? Who makes him deaf or mute? Who gives him sight or makes him blind? Is it not I, the LORD? 12 Now go; I will help you speak and will teach you what to say."
Jeremiah 1:5-8 (NIV) 5 "Before I formed you in the womb I knew you, before you were born I set you apart; I appointed you as a prophet to the nations." 6 "Ah, Sovereign LORD," I said, "I do not know how to speak; I am only a child." 7 But the LORD said to me, "Do not say, 'I am only a child.' You must go to everyone I send you to and say whatever I command you. 8 Do not be afraid of them, for I am with you and will rescue you," declares the LORD.
2 Corinthians 10:10 (NIV) For some say [of Paul], "His letters are weighty and forceful, but in person he is unimpressive and his speaking amounts to nothing."
"I would rather be among those who are unknown, unsung and unheralded doing something through the Spirit of God that will count even a tiny little bit in the kingdom of God than to be involved in some highly-recognized expression of religious activity across which God will ultimately write the judgment: 'This too shall pass!'" -- A. W. Tozer
The Tozer Topical Reader – Volume One, comp. Ron Eggert, (Camp Hill, PA: WingSpread Publishers, 2007), WORDsearch CROSS e-book, Under: "363. Eternal perspective; Unsung heroes".