"It was this Aaron and Moses to whom the Lord said, 'Bring the Israelites out of Egypt by their divisions.' They were the ones who spoke to Pharaoh king of Egypt about bringing the Israelites out of Egypt - this same Moses and Aaron." NIV translation
The purpose of the family tree that we saw was to establish who it was that God had selected to carry out this task. We see that they had a very clear cut mission which was to lead God's people out of Egypt. We also notice that they are listed twice and that the order is reversed the second time. This is a reminder that they were equals in the sight of the Lord. We often hear of Moses because God used him in this mighty way but we hear the name of Aaron less even though he was right there with Moses.
The same thing can happen in our Christian walk as we may be a part of a larger ministry of God but do not receive the recognition of men. Even so, we can be assured that God takes note of our service to Him.
"Now when the Lord spoke to Moses in Egypt, he said to him, 'I am the Lord. Tell Pharaoh king of Egypt everything I tell you.' But Moses said to the Lord, 'Since I speak with faltering lips, why would Pharaoh listen to me?'" NIV translation
When called by the Lord, Moses' answer was that he was not capable. He understood that the mission was huge and he did not feel up to the task. This is common among the people that are used by God in mighty ways. It is very rare that God will use someone that is prominent or especially well trained.
Moses lost sight of the fact that God was the Deliverer and that he was only to be the messenger. As Christians, we can fall into the same type of thing when we think of sharing the gospel with those around us. It is one thing to be humbled and honored that God gives us the chance to serve but it is another to think that success depends on our efforts or abilities.