Exodus 3:11

But Moses said to God, “Who am I that I should go to Pharaoh, and that I should bring the children of Israel out of Egypt?”

 Exodus 3:13

Then Moses said to God, “Indeed, when I come to the children of Israel and say to them, ‘The God of your fathers has sent me to you,’ and they say to me, ‘What is His name?’ what shall I say to them?”

 Exodus 4:1

 Then Moses answered and said, “But suppose they will not believe me or listen to my voice; suppose they say, ‘The LORD has not appeared to you.’”

 Exodus 4:10

Then Moses said to the LORD, “O my Lord, I am not eloquent, neither before nor since You have spoken to Your servant; but I am slow of speech and slow of tongue.”

 Exodus 4:13

But he said, “O my Lord, please send by the hand of whomever else You may send.”

 When God spoke to Moses at the burning bush and told him that he was to deliver the children of Israel out of bondage, Moses replied back to God with the above five questions.  In all of these questions, or we may call them excuses, God had an answer for Moses.  In our prayers let us never be afraid to question God as Moses did, even give excuses.  For God will answer all our questions and strengthen us in all our doubts.