A high school student recently told me he was interested in becoming a meteorologist. He wanted to know what kind of classes to take in high school. I stressed to him the importance of speech classes, computer classes, physics classes and math classes. If there was one subject I had "brain lock" in, it was math. I hated math. Any kind of math. Probably because I wasn't good in it and math intimidated me. When I got into graduate school at Mississippi State University, I quickly realized the math load associated with the meteorology classes. There was only one thing I could do: quit! I became so frustrated, but I truly believed meteorology was where God wanted me to be. Finally, I told God "If you want me to do this, to make it and to not be a failure and waste my parents' money, YOU are going to have to help me with math!"
Moses had brain block when it came to speaking. Exodus 4:10 says, "And Moses said to the Lord, O Lord, I am not eloquent or a man of words, neither before nor since You have spoken to Your servant; for I am slow of speech and have a heavy and awkward tongue." When God called Moses to be His spokesman to Pharaoh and the Israelites, Moses told God he wasn't eloquent enough to do what God wanted. God's response in Exodus 4:11 was, "Who has made man's mouth? Is is not I, the Lord?" We think sometimes that God does not know about all of our weaknesses, but He does.
In Exodus 4:12 God told Moses, "Now therefore go, and I will be with your mouth and will teach you what you shall say." The next time God tells you to do something for Him or to speak for Him and you get fearful or anxious, remember: if He has sent you or called you, He will be with you. The doubt must go before you can go.