I agree with Stan. He seems to be displaying a combination of the three. I read somewhere in the study that Moses was educated and was a strong speaker. Yet he claims a speech impediment, which God appears to accept while offering an alternative. As Pastor Wilson suggested, his reaction may be a sign of his brokenness. He may have consciously dropped the trappings of education and royalty while adopting the lower status as a shepherd. Thirdly, he clearly does not know God. "Who shall I tell them has sent me..." If he is going to have difficulty explaining God to the Hebrews, he really is saying, "I am unqualified". While faith is trusting in the unknown, do you not have to know God to have faith in Him? God reassured him by saying, "I will be with you". He went on to tell him that he would prove it by having the Hebrews worship at that very place later on. I do not know how much help that was to Moses at the time. God gave us his Word. He reassures us through accounts like this one in Exodus. Also he sends people and situations to us as inspiration. We just need to see and hear them.