"Get yourself ready! Stand up and say to them whatever I command you. Do not be terrified by them, or I will terrify you before them" (Jeremiah 1:17)
Boldness is an asset to speaking on behalf of the Lord especially when the Lord is backing you up. If he has promised to fulfill his word then there should be confidence in that. I remember the first time I realized this. It was a Sunday morning and I was getting ready. I was preaching that day and my normal routine was praying something along the lines of asking God to make me humble, to make me disappear at the pulpit so people would see the Lord in me. And I remember the Lord speaking to my spirit that they couldn't see Him if I disappeared in middle of the message. They would see Him and His power if I preached the word without fear and with boldness through the Spirit. It goes back to lesson #2, it is God who qualifies. The congregation knew who I was and also knew when the Lord was speaking through me. He started encouraging me that day to enjoy teaching and to be bold in it. To put my confidence in Him and he wouldn't let me down. Everything changed that day, because the Lord taught me this lesson... He is my courage and won't put me to shame.